Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d3264843677eb…

MALICIOUS

PDF

81.9 KB Created: 2020-12-25 07:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18732923fc3225172ab8cd2ff9487ae7 SHA-1: 17a8f9cbd417fc017b2593f691beb1facdbdead3 SHA-256: 1a5d3264843677ebef86afbde8c2dd1b4a9d68ce733bdf7ee3d59366d85997e1
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of external URLs and the nature of the heuristics indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=fake+nails+walmart+canada
    • https://cdn.sqhk.co/papusabefo/gggfshi/nomamedepulinubolatuk.pdf
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/xuzezifugemo.pdf
    • https://domenotupeloli.weebly.com/uploads/1/3/4/6/134685365/vopiwok-robil-xurebezokavol-dedokubora.pdf
    • https://rixemeja.weebly.com/uploads/1/3/4/7/134711448/5117483.pdf
    • https://cdn.sqhk.co/lisutovudaf/itieZie/53466150983.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.orgThis
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jivagajamav/cd_audio_format_flac.pdf
    • https://s3.amazonaws.com/nazekisigiduz/lisevoxanowis.pdf
    • https://s3.amazonaws.com/jewizopukuni/9500635979.pdf
    • https://s3.amazonaws.com/fizufapu/32391994283.pdf
    • https://s3.amazonaws.com/wifukedot/install_kali_linux_android_linux_deploy.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
    • http://scripts.sil.org/
    • http://scripts.sil.org/OFLAbyssinica

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d651.bin
158f8649ccbf0a35c8302b96f520981c05f02501e830a2e1e87c89db59e0e5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 4876 bytes
font_01_sfnt_off0000e6d7.bin
08efadcdd1e6218e79893bc5ab6ecb723c6943bfae66b2e27d7dc6f8889c707b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 20932 bytes
font_02_sfnt_off000106df.bin
d5108a09dda3b5b7070dfceeda99b705e43b88c8362d6e3e02fdcca92ac90b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 11192 bytes
font_03_sfnt_off00012c80.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 4324 bytes

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