Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f41081f8adba3d4…

MALICIOUS

PDF

80.4 KB Created: 2020-11-17 06:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcecf1f2f4f188a71ef4219cd0a0f038 SHA-1: 524c6e07685f1ae445dbacd7324d07d85ec47870 SHA-256: 8f41081f8adba3d4af36d5e9d903c2947bdd95a300052cd5752747a0deea04f7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme. The primary malicious URL identified is https://trafffi.ru/123?utm_term=biology+lab+report+example+high+school, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=biology+lab+report+example+high+school
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/2970659.pdf
    • https://cdn-cms.f-static.net/uploads/4421970/normal_5fa8907d3d557.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f90dd34e5def.pdf
    • https://cdn-cms.f-static.net/uploads/4408989/normal_5fa95f1ba80f0.pdf
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/bexonemedumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jebupofedijakuk/18777967194.pdf
    • https://s3.amazonaws.com/vavale/essay_writing_worksheets_for_6th_grade.pdf
    • https://uploads.strikinglycdn.com/files/ee4406e4-180b-493c-ac06-b9d300b863ac/visevowirowenewo.pdf
    • https://s3.amazonaws.com/susopuzupure/7358549020.pdf
    • https://uploads.strikinglycdn.com/files/8349f0b2-f937-4fbe-af1a-7081c93aad08/23756397783.pdf
    • https://s3.amazonaws.com/pewebopufupe/xejiwoxusekofu.pdf
    • https://s3.amazonaws.com/mawesenasijoser/grace_period_for_expired_drivers_license_co.pdf
    • https://s3.amazonaws.com/nalifij/jekufifebexemur.pdf
    • 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_off0000f131.bin
113e036c6f7fd696dcb5fa4fe8ad5871812423e3298db8f1ee2dcabff70564c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 5388 bytes
font_01_sfnt_off00010389.bin
b4d271532ee9f60f12b94073b211f344f99f762226c8192f00f4c272c5b896c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10192 bytes
font_02_sfnt_off0001265e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 4324 bytes