Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c4d357ea367044…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 01:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d3be3bc48cad79d90acbf5f5370b91c SHA-1: d7d53336b9036bc045de7ed2272388f2b662fc00 SHA-256: 12c4d357ea367044b9b40178e150d94910b5808cb2ab70cd007088e5f9d36785
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The document body, though heavily obfuscated, contains keywords related to 'physical security risk assessment', suggesting a lure. The presence of external links and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing or malware-hosting sites.

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/award?keyword=physical+security+risk+assessment+pdf
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5ff1d09e5fcbf.pdf
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/korafogawomutevisil.pdf
    • http://roskycnmx.com/masked_singer_gronk_white_tiger_performance70591.pdf
    • https://narezivif.weebly.com/uploads/1/3/5/3/135307162/dedawasizibus_kojemati_sekomiwewugi.pdf
    • https://static.s123-cdn-static.com/uploads/4484633/normal_600390f7d185e.pdf
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fc903ddb3b7d.pdf
    • https://cdn-cms.f-static.net/uploads/4418566/normal_603fd94cc720d.pdf
    • http://uablog.website/discord_go_live_not_appearingbqcar.pdf
    • https://gededojoseg.weebly.com/uploads/1/3/4/3/134341448/3056618.pdf
    • https://wojemalivameju.weebly.com/uploads/1/3/0/7/130775107/bilinulapipo.pdf
    • http://maykistore.ru/20781573846h6i0t.pdf
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/kigavixemeza.pdf
    • http://springtea.space/materi_patologi_kebidananeq4kb.pdf
    • http://ostanni.fun/63267697835pxt4u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_809de56de1984f4680568468e90a79a6.pdf?index=true
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_b5ac5f26953445c18bdfa56b8f96b889.pdf?index=true
    • https://s3.amazonaws.com/patilawasu/gozimiwixarire.pdf
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_8bc6bd19021344339c61ad4df2a90d42.pdf?index=true
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_15ebb290ebca475e9152fe2884680da0.pdf?index=true
    • https://s3.amazonaws.com/lowuwofuxali/sawibaditujojemefif.pdf
    • https://s3.amazonaws.com/wupiwupiwot/ay_ft_fid_q_microphone_mp4.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_off0000e7b9.bin
1183d78068e5ba45b7a06155649eb300facf260e3afbcf2087cedcbb90a37f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5564 bytes
font_01_sfnt_off0000fa89.bin
8db7d225ed7f70a7d894c8cbbadf6c906591daa7ab7a81c16d3fe7f40a1131c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 10952 bytes

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