Malicious PDF — malware analysis report

Static analysis result for SHA-256 347c396bc3819b49…

MALICIOUS

PDF

86.9 KB Created: 2021-03-07 23:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3168e4bef25670b8fdcf1066c49daa63 SHA-1: f311eed5a9b667ca93c59e8f26e86c6e8e117397 SHA-256: 347c396bc3819b496e6557026eda9d9a401ef287fb4fc192b77fefcb54e1c40b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The primary malicious URL identified is 'https://dafemum.ru/strik?utm_term=how+to+turn+on+bluetooth+on+hmdx+speaker', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to turning on a Bluetooth speaker, suggesting a lure to disguise the malicious intent. The presence of multiple links and the ML classifier flagging indicate a high likelihood of malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=how+to+turn+on+bluetooth+on+hmdx+speaker In PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/Uqhbghr/xukafanufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6019d8b5b6258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_6003b36257d91.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/hhZwge8/72289429637.pdfIn PDF document text
    • https://cdn.sqhk.co/guzupewad/iidjfJZ/bomimubuvizagoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18d2a1b2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_601753079b89a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fe7cb8897051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_71e026966f4f4cbca81b70bc6abe7a3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b4fd11-8fde-4bf4-9391-98b1f0f22c5d/tp-link_tl-sg1005d_configuration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd12a03-91a3-4fbd-a25b-717bcaaef586/my_bissell_proheat_pet_wont_suction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efecd43a-ad9c-4a73-9d35-7301ca27c5e5/ohsen_watch_price_in_uae.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/harlem_by_langston_hughes_poem_analysis.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_ff0bfb989acd412da3433a9951f6c512.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8676ef2-cbb6-4fba-934e-82bccb90907d/26557208626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726b8043-e586-463e-b2d4-57d57cb3bfd1/innova_ford_obd1_code_reader_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805a9f83-78fa-461d-af07-db2ce901ba4d/apc_back_ups_700_continuous_beep.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/barsaat_mein_ka_gana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914d0dd5-d6d4-4cfb-b52f-0eb1c0d33e4e/samsung_dishwasher_dw80j3020us_wont_turn_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f5c058-2342-4207-9bd1-4d358ae82503/relapse_prevention_therapy.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_7aa65c456b2146cb9f9c1a5dc5259eee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b83040-49ff-4262-babe-af53187cac2a/what_animal_is_the_mandalorian_symbol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 5360 bytes
SHA-256: 172c0d4aa436e43df669bb9c55613e5739a93e02ad56f18069b3a71b723a9239
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10756 bytes
SHA-256: da454db0e29edce8d1bd28774fe6b545313d175bc2e017ca3b1314bdb4f7f9e2
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_03_sfnt_off00013fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f