Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a5bdefbc626f79…

MALICIOUS

PDF

70.5 KB Created: 2021-04-02 21:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a580febf4776114c47042777dd4ee9d SHA-1: 51ed7be2e82f4c5da988db72c33985e27568337e SHA-256: 72a5bdefbc626f79b2f7c67bbc459b1f283797e26c9ada2f3a8e7ae99c516028
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 hosted on dynamic DNS services or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF_SEO_LINK_FARM heuristic point towards an attack pattern focused on redirecting users to malicious content.

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://jacksth.ru/123?utm_term=python+indentation+formatter+online
    • https://cdn.sqhk.co/naliwanik/rgicq9C/survival_kit_backpack_diy.pdf
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/6711690.pdf
    • https://cdn.sqhk.co/mugolino/jjvhcjd/online_mobile_recharge_bsnl_validity.pdf
    • https://static.s123-cdn-static.com/uploads/4404488/normal_600434ba122af.pdf
    • https://cdn.sqhk.co/dodagirojep/g85Okjh/solubility_equilibria_worksheet_answers.pdf
    • https://cdn.sqhk.co/bumajanivosi/HkjdjjT/kagedix.pdf
    • https://cdn.sqhk.co/jefigujaxev/AheHcUn/58398708086.pdf
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/puvidumin.pdf
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/jokokor.pdf
    • https://cdn-cms.f-static.net/uploads/4368240/normal_601693d6c60f7.pdf
    • https://static.s123-cdn-static.com/uploads/4371013/normal_6005dfa34aff4.pdf
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fcbd95f70d57.pdf
    • https://cdn.sqhk.co/denobafopum/giijial/perodidosaxisezavidodo.pdf
    • https://cdn.sqhk.co/mixaluwekitu/xighfSP/viral_tiktok_songs_october_2020.pdf
    • https://cdn.sqhk.co/bezugisav/2ggAhiT/my_sprint._com_app.pdf
    • http://doxedisipi.scienceontheweb.net/53896371047.pdf
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fd776a756238.pdf
    • https://cdn.sqhk.co/fubemabofof/gfiaPge/89544584686.pdf
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/d52d12277c.pdf
    • https://lisewaduw.weebly.com/uploads/1/3/4/3/134358893/2fb1561.pdf
    • https://cdn.sqhk.co/wanazofemuvu/i3jbjhf/ecosystem_worksheets_5th_grade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxulikiwab/blackberry_os_apps.pdf
    • https://s3.amazonaws.com/xeropizuwe/muvutusagomatawiwov.pdf
    • http://xevijojikutep.onlinewebshop.net/xikowakuwegumudiko.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_off0000d5d3.bin
d9cbcd7758ff23e772eba45f3a9bcf67fe79dc3630bb0d64d71b5d437cbf2272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 5072 bytes
font_01_sfnt_off0000e6f5.bin
c28473caebc0dc7a0a18a4935009d38d87d617b5786021e0164ebddeaf2944b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 10484 bytes

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