Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f43b326254fdfb2…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 11:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316bc3d4658a6f5234025859ae18d5d6 SHA-1: 92e277e16e05f6006c28a4a3d86f59d53efa70ed SHA-256: 0f43b326254fdfb2464e40e0adb06d060d7c2d5c54d156571779cf94c0e055b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=fish+cheeks+assessment+answers
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd380bf8e383.pdf
    • https://cdn-cms.f-static.net/uploads/4454167/normal_600f292ea4c5f.pdf
    • http://freefire-gifts.com/cisco_networking_all-in-one_for_dummies_downloadkcn13.pdf
    • http://donbetosstreettacos.com/birojuzsmxn.pdf
    • https://cdn-cms.f-static.net/uploads/4476601/normal_603f0452a1f98.pdf
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5fde10ea11923.pdf
    • https://static.s123-cdn-static.com/uploads/4390056/normal_5fee0ecf2f737.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_601280b59550a.pdf
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5fe4327396986.pdf
    • https://cdn-cms.f-static.net/uploads/4467936/normal_5fd10db6a53a8.pdf
    • https://cdn-cms.f-static.net/uploads/4491433/normal_60175907c4cb7.pdf
    • http://reawont.online/77761148949j7mnb.pdf
    • https://static.s123-cdn-static.com/uploads/4404500/normal_6007fbbea2982.pdf
    • http://blockhcain.host/jeromavakunu89w5g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6731ed4e-ff80-4462-a876-1d1ecd442cf9/how_do_i_reset_the_code_on_my_lg_washing_machine.pdf
    • https://uploads.strikinglycdn.com/files/8a375295-0d2d-40cd-8954-91a90325e5d5/17118772061.pdf
    • https://72e62e31-3264-46ee-af74-0bc67392f022.filesusr.com/ugd/f34823_c28c3da762c343bea101a7b0fbd03483.pdf?index=true
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_5552b71df0504165981864e9c24fc8c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c70260e-daa6-406e-bb06-0f19e44ac5aa/can_google_home_play_music_on_my_phone.pdf
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_2aee1c315611423797b0dbf43216f251.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e3.bin
e1fd6717d27cb2cd7a9d04a59e799d4120661e9e6bc21097401c66d921c64901		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 3420 bytes
font_01_sfnt_off0000fe34.bin
3e28f50b21df932fa02e9994c4442c7efccad2412046b3f03ea0ef39d7aca7c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 5120 bytes
font_02_sfnt_off00010f87.bin
e7fe79caffb52e973b2c87dcac17a658d74bf0bb25b96a540fd1e919a355b429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 10388 bytes

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