Malicious PDF — malware analysis report

Static analysis result for SHA-256 358d4006ca11b2cf…

MALICIOUS

PDF

85.3 KB Created: 2021-06-04 15:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bf19be7fdadde2689c006b65ed64f9d0 SHA-1: f72781c1891e35993b5fa28499b6f8c1bd001fd4 SHA-256: 358d4006ca11b2cf43f86719ff462fa3240454f7e89d32ed1ad4dd904b288584
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/pbw?utm_term=permission+letter+for+child+to+travel+with+grandparents+sample PDF link annotation
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/2576805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fe3a3eaa37a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5fe796d7de55f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5fc994f6b497d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5ff3cd47244f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_606cd9e60cd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_601bb4004d1d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5ff139d178e80.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/bewuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_603c217149b36.pdfIn PDF document text
    • https://wokusozevopiwaj.weebly.com/uploads/1/3/4/3/134381386/malukiwamitevix.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/3178321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378161/normal_5fe5808cb9ab8.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/d5255f07-45c1-43b7-acce-ed5f5f2077b5/vozogaxovor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fa5551-7448-43a3-99c5-5c1484687c92/philips_series_5000_beard_and_stubble_trimmer_with_self-sharpening_metal_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86346ba0-58c2-4bf1-967c-92c795ef3107/how_much_is_an_oil_change_for_a_6.7_powerstroke.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/how_to_make_a_medieval_peasant_dress.pdfIn PDF document text
    • http://gibabug.pbworks.com/w/file/fetch/144575184/74669884366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2315d46-493e-4762-985a-6d923a4c0dd9/zagav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e166406-90b1-48ff-9199-4a75f9cb0806/diamond_infinite_edge_pro_vs_sb-1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69df62a5-f334-44d0-8c83-49fa63333811/what_is_the_meaning_of_putting_on_the_whole_armour_of_god.pdfIn PDF document text
    • http://jevibufile.pbworks.com/f/60570177953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec8dc69-2f95-442b-87df-f9aa588c6ec3/nelefadegibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb6c9b2-2754-46a9-b625-68a43bda4e15/how_do_i_connect_bluetooth_to_my_bose_wave_radio.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 5508 bytes
SHA-256: 0c0ccb8ade941444244ddd16f3a4df925a6369440642aee943b2d8a84edeb451
font_01_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 10812 bytes
SHA-256: 646d80639a0f512c72e79d98217d4733f090a20e0f37886443aaf083df6b4b5b
font_02_sfnt_off000138cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f