Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49003f2f3b7d8a1…

MALICIOUS

PDF

75.1 KB Created: 2021-04-11 01:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c361fe275c2844373b42d723938e66 SHA-1: 3d9965b0ea1f7917dd228051c0439e34a8d58b98 SHA-256: c49003f2f3b7d8a19dd9660e78ba0f11d575a788c0e07d5a01a8d2f4250eb949
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm strategy. The primary URL observed is https://resalured.ru/strik, which is likely part of a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=fantastic+fan+ultra+breeze+vent+cover+smoke
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/bifepawelininer.pdf
    • https://cdn.sqhk.co/makubeku/owLjaNQ/rivals_at_war_firefight_mod_apk_no_root.pdf
    • https://cdn.sqhk.co/kuvuwisarov/ehfghjb/3990250306.pdf
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/pibigoba.pdf
    • https://cdn-cms.f-static.net/uploads/4371524/normal_602f7f3213c01.pdf
    • https://cdn.sqhk.co/vemudumuxixu/hd78uji/mega_boost_jump_pack.pdf
    • https://fuvedomuwipiw.weebly.com/uploads/1/3/1/6/131636935/6530da58.pdf
    • https://zibitevurus.weebly.com/uploads/1/3/0/7/130776177/df55f158f5011.pdf
    • http://boforobevuziko.mywebcommunity.org/suwuwopizidufitivo.pdf
    • http://manovina.mypressonline.com/10038579823.pdf
    • https://cdn.sqhk.co/nigalasiline/oiegjQQ/dolisinegidavetobazu.pdf
    • http://lumufurisazela.mywebcommunity.org/bawux.pdf
    • https://cdn.sqhk.co/kovezozeseg/V52nsib/78031788701.pdf
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ff8087b025cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/watajive/69922380787.pdf
    • https://s3.amazonaws.com/kelukakeb/completing_the_square_formula_for_h_and_k.pdf
    • https://uploads.strikinglycdn.com/files/7e6bb1c7-1343-4086-8499-41a99e8820c5/80905858182.pdf
    • https://s3.amazonaws.com/xufaxoferugod/zibizabopavanowovowize.pdf
    • http://tediguku.atwebpages.com/mipiruwezixamopetolitiwut.pdf
    • https://s3.amazonaws.com/fedufiporara/ruxolopuz.pdf
    • https://uploads.strikinglycdn.com/files/3d322000-4233-4eaf-a338-eab1ef2621c5/30310327758.pdf
    • https://uploads.strikinglycdn.com/files/705f3b04-f61f-405e-ba4c-744fcb5d2572/nixofosesebijib.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_off0000e641.bin
3cf3e9fc72034777b5d09554d10233639c00ab41bd51adcd86a1e19f8a79c338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 5296 bytes
font_01_sfnt_off0000f847.bin
998babc6c75115d0f8ec7019042c90b0a97360897c51046b26a2de4d4a69157d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 11360 bytes

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