Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9df08a74a41c1f7…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 23:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e1317952f685819facc6a34e8479a6f SHA-1: 51cbff87066bc06027e2a0e23efa27d3ce066a7b SHA-256: c9df08a74a41c1f77fd32ea79d6cd870217e94c1352e4548f631e142c627739e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The primary URL, 'https://vilenefex.ru/wix?keyword=google+apps+set+up+forwarding', suggests a lure related to Google apps setup. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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://vilenefex.ru/wix?keyword=google+apps+set+up+forwarding
    • http://wordsidepost.top/ken_blanchard_lead_like_jesus4gpbh.pdf
    • https://kubetezoruxi.weebly.com/uploads/1/3/4/6/134600107/9463004.pdf
    • http://poopo.ru/98321237240h58cs.pdf
    • https://cdn-cms.f-static.net/uploads/4471969/normal_6028f9ed6ba68.pdf
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5feb7ba0bd541.pdf
    • http://komarovskii.xyz/juwozomudabamivinajubuzalmknr.pdf
    • https://futuratolofuzup.weebly.com/uploads/1/3/5/3/135399438/mebikulekujor.pdf
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/1134736.pdf
    • https://cdn-cms.f-static.net/uploads/4366633/normal_603dd312a3b8b.pdf
    • https://cdn-cms.f-static.net/uploads/4454821/normal_602347ae0b4c0.pdf
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/pimodazug_seramogutez_viximufu.pdf
    • https://cdn-cms.f-static.net/uploads/4470826/normal_603c36af1cc12.pdf
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/4856e80ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_3c6c4b3566594c209932129bd0894503.pdf?index=true
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_ae8c055b5b3b425ba27af5c3b679a30d.pdf?index=true
    • http://nifiwirijapokaf.rf.gd/37214675361.pdf
    • http://ligagenaragad.rf.gd/deadliest_catch_rs3_guide.pdf
    • http://gibonoxemibete.rf.gd/facebook_advertising_template_psd.pdf
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_508ebc82d3034bd0acc0702e55f7b1f4.pdf?index=true
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_fa9f1eb4f2424354b409540f5393ab6b.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_2250af15e1724d7c8e6bf4692988bcb5.pdf?index=true
    • 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_off0000e65d.bin
0c30ce977667338b9847d9d015183b68fea8b101caedc8f63cf5d3cb39915591		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 5332 bytes
font_01_sfnt_off0000f8a7.bin
9a989483e8ae6b2d08385a070734cc38f101633c5d037142d679a2194b1d88c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10644 bytes

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