Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa03a48ad866e3c…

MALICIOUS

PDF

85.9 KB Created: 2021-03-20 18:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02b8c60fed50df423955d8b9fef8baf6 SHA-1: 76243b378552394d40996439f41b63abcb573cf7 SHA-256: 2aa03a48ad866e3cf059b13bcf1dec3c6fd256ebc6702765f49220383ade8ef6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain 'jumiwimov.ru' that is likely part of a phishing or scam campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=best+dunkin+donuts+secret+menu
    • https://cdn-cms.f-static.net/uploads/4491152/normal_6021f7830cb35.pdf
    • https://cdn-cms.f-static.net/uploads/4370092/normal_603495be7ec69.pdf
    • https://cdn-cms.f-static.net/uploads/4413703/normal_6025e5045a62a.pdf
    • http://excellent-spb.ru/lilefavibume9m7sb.pdf
    • https://cdn-cms.f-static.net/uploads/4423772/normal_60246b11f0e2d.pdf
    • https://cdn-cms.f-static.net/uploads/4391898/normal_5fdaf413d19c3.pdf
    • https://static.s123-cdn-static.com/uploads/4449421/normal_5ffc0a6fd009b.pdf
    • http://raisinsapp.club/vesujugawinodebuxarekofa4sk9z.pdf
    • https://static.s123-cdn-static.com/uploads/4530846/normal_5fee93e830978.pdf
    • http://endi-itali.space/sodubiwasijafexaliwoko0944t.pdf
    • http://montana-media.com/imr_reloading_manual75i3q.pdf
    • http://vash-komfort5.ru/nezugopidewuqjaee.pdf
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5fffb28488141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a787d432-8491-4ffe-8c6c-4c4e0bce114b/jefitabomave.pdf
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_6b65e79c4b5d4479966b8302781402a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cac84181-77c2-4af2-a725-9a61e13fe1a2/kezolajevamoni.pdf
    • https://uploads.strikinglycdn.com/files/bf0e36fe-2114-4aaf-b1c2-1a4a6e509aff/12532329049.pdf
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_f029186b2b0e4898b15529e228953e18.pdf?index=true
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_f8f5b92197164bac82f1bfa6146cec7f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b6d266c0-70c4-4ff5-a64d-e702193c480e/78086036603.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a4.bin
e0aaa533c91842d41e0bab41c279fd83af9c5a29dd6eae7284a651200f6ec7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 4956 bytes
font_01_sfnt_off00011a6b.bin
d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 1796 bytes
font_02_sfnt_off000122f7.bin
736375f41d82f866cbcda84234185344356246b710717f72f5d8e65da9b36394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 10880 bytes

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