Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5ee963775e1a05…

MALICIOUS

PDF

82.1 KB Created: 2021-03-24 18:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06e21a409c84df286e65bed419743359 SHA-1: edce2980623ad02ea5b8ed07d789c9837e2ee4cf SHA-256: 2e5ee963775e1a055ec2824e00e2377b76f04a122127dd8982474a0d14e305b3
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm, and one of the URLs suggests a 'win driver backup free' lure. ClamAV detection and ML classification strongly indicate maliciousness. The presence of embedded URLs and a 'download button' heuristic further support a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=win+driver+backup+free
    • https://static.s123-cdn-static.com/uploads/4391893/normal_6005dccf6f26c.pdf
    • https://cdn.sqhk.co/mowasikuso/LjaTXIk/asphalt_mix_design_lab_report.pdf
    • https://static.s123-cdn-static.com/uploads/4454825/normal_5ffac95bd0910.pdf
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5fdcd3a683c68.pdf
    • https://cdn-cms.f-static.net/uploads/4420760/normal_603ffcbae6980.pdf
    • https://static.s123-cdn-static.com/uploads/4367286/normal_6003c6c17c82a.pdf
    • https://cdn.sqhk.co/jogepirar/Yq0mBea/short_films_for_students.pdf
    • https://cdn.sqhk.co/mogizufofuj/ijbvPjj/niwogoluzosovuwu.pdf
    • https://cdn-cms.f-static.net/uploads/4480408/normal_605a0e97cb04e.pdf
    • https://cdn-cms.f-static.net/uploads/4444115/normal_604802ac32bdd.pdf
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/fitakif-vakezazexofezo-sigipaliviruwa.pdf
    • https://static.s123-cdn-static.com/uploads/4447433/normal_5feb6aa12bbbb.pdf
    • https://cdn-cms.f-static.net/uploads/4481163/normal_60570d67b0fe4.pdf
    • https://cdn-cms.f-static.net/uploads/4426675/normal_601e138137d16.pdf
    • https://cdn-cms.f-static.net/uploads/4473049/normal_605720f25bf63.pdf
    • https://cdn-cms.f-static.net/uploads/4495393/normal_6055abb18902d.pdf
    • https://cdn-cms.f-static.net/uploads/4480905/normal_605707e038a16.pdf
    • https://cdn.sqhk.co/bowewulaxam/ghjcjib/superhero_hook_stickman_swing_rope_hero_2.pdf
    • https://gikilona.weebly.com/uploads/1/3/5/9/135966600/gevokibizap.pdf
    • https://cdn-cms.f-static.net/uploads/4485446/normal_601f85b6ee3d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010261.bin
d0053a397138d9b643f9de98fa4f3439d1d5bf97c6ee920d846d83435145ec76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 5216 bytes
font_01_sfnt_off00011446.bin
4097085d44ebadea938e29330e74449d44da41d25ca6ce64045a9aea3a09453f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 10832 bytes

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