Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fc69e97837b5c2…

MALICIOUS

PDF

90.1 KB Created: 2021-04-07 20:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ee43f38313a6a3e1246fc875e474d570 SHA-1: f71b1f4ff08150af6a12352d1d17c8aead69f873 SHA-256: f5fc69e97837b5c24cb6273ddece8e56e5a441e463d92b4874459eb3d17bcb18
146 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and a high ML classifier score, indicating malicious intent. It also includes an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely used to host a phishing or scam lure. The document body, though heavily obfuscated, appears to contain text related to appliance hookups, suggesting a pretext for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/strik?utm_term=lg+steam+dryer+hookup+to+hot+or+cold+water PDF link annotation
    • http://sumigemag.mywebcommunity.org/57084770431.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/61310159994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fd76f2579d72.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/kasivesibebokove.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/52678714184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_60467acd084a2.pdfIn PDF document text
    • http://bovizanaranofo.22web.org/rowinipikamafanifiv.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/beats_studio3_wireless_headphones_-_beats_camo_collection_-_sand_dune.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://uploads.strikinglycdn.com/files/ed08f771-495f-4827-b404-77a8fdcbaea5/is_lawn_boy_out_of_business.pdfIn PDF document text
    • http://gesulobanaxa.rf.gd/fundamentals_of_electrical_engineering_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8b1824-7b25-408c-9340-e3d82e9a05c1/33778301925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae15f82-3013-4a87-aadc-ae177a4f552a/7599492856.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/xojitowivakiranudilazigez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7005e86f-f324-411b-bdee-c7b30032312a/89318899223.pdfIn PDF document text
    • http://pakebixulo.epizy.com/graduation_certificate_template_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1a1e5e-16a2-40b5-9223-349aa372690f/taworosegomumevusiga.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/zajabamunexenuxogogukuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210974d6-3bbf-427b-8fb0-5d2b2605fc58/what_is_a_life_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08103f8b-c0d1-4dbd-a778-dfdd5eb2b18a/33007866580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea218760-643d-4d45-aa0b-ce2eaf3f5ce6/vobiluvonozexugerer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488c2113-9469-4751-97fd-56e2fc2c8c9b/jajafepinisiwidu.pdfIn PDF document text
    • http://likifodafiduno.epizy.com/sri_rudram_meaning_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929a3aff-96cb-40f7-ac3e-8e3c72cf1441/52515134207.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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 5416 bytes
SHA-256: f7691c5985d017c361ead218071501f8edcb89a2b21beb4acbca1c878b4ab3cf
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 11260 bytes
SHA-256: 8a884c2b9fead903818b198fa0825c0ece6af739de4eb6df3c37faabd8abd3b8
font_02_sfnt_off000136b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B9 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00014be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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