Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83330f31e2786ec…

MALICIOUS

PDF

94.6 KB Created: 2021-04-02 11:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 363efd7e69c6b7387d2d7fe0f5639065 SHA-1: cfdbed0773c4c25c61c589cfdae5d170e696fc90 SHA-256: b83330f31e2786ec04096994dbe9d4880b5747eb2df3636d413f60a3572c706e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a high volume of links, suggesting an attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://golowaki.ru/123?utm_term=mobogenie+no+1+android+portal+indir
    • https://cdn-cms.f-static.net/uploads/4477164/normal_60503a6ec68eb.pdf
    • http://beststudent.fun/570674082676ujzs.pdf
    • http://neuroncraft.online/78689558598a2ziz.pdf
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6018e9bb111fc.pdf
    • https://cdn-cms.f-static.net/uploads/4475215/normal_60369eecca362.pdf
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5fe9414ad4244.pdf
    • http://feelslike35.com/651350726877fcm7.pdf
    • http://expressvpn.store/fibobefatulhudy9.pdf
    • http://tophomework.space/pay_my_verizon_wireless_business_bill7m5eh.pdf
    • https://cdn-cms.f-static.net/uploads/4425784/normal_6028a970e2f8a.pdf
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/14a1f3771cf385.pdf
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/gosevumadebefeb.pdf
    • https://cdn-cms.f-static.net/uploads/4472481/normal_603ebc6694379.pdf
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/jokuribavoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rovikibixu/14891210476.pdf
    • https://s3.amazonaws.com/zexozavo/98042455682.pdf
    • https://s3.amazonaws.com/jexijer/duvukobanovom.pdf
    • https://s3.amazonaws.com/pewebopufupe/best_camera_app_free.pdf
    • https://s3.amazonaws.com/radubozufiwo/crane_composites_installation_guide_6876.pdf
    • https://s3.amazonaws.com/dewutexorob/lofelakiluwowemomo.pdf
    • https://s3.amazonaws.com/mukut/1080p_hd_video_er.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135be.bin
630f4a89219cd006d751862073f084f61595d942b4e3adf4ccc323b28db4b90e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 5148 bytes
font_01_sfnt_off0001475a.bin
7b36b5b9bb3312c5e990d1960d95da38bd57a0322a1cd54a27a6cb9546d01402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1475A 11044 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.