Malicious PDF — malware analysis report

Static analysis result for SHA-256 d049b9e46a9e202d…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 14:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4588f03e4334371c61613690347a7c SHA-1: e65b88c7b64ae2cdce064719a160654176686eb7 SHA-256: d049b9e46a9e202d1ac8a1db6febf10a76617009b106b38b57429f98809d4f34
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, including one pointing to a VPN download keyword search, suggesting a phishing or scam attempt. The presence of a 'download button' heuristic further supports this, although the document body itself is heavily obfuscated and does not contain readable text.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=betternet+free+vpn+proxy+apk+download
    • https://cdn-cms.f-static.net/uploads/4382972/normal_603ffc679526a.pdf
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd92e5b65de3.pdf
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5feb9557a0417.pdf
    • https://cdn-cms.f-static.net/uploads/4460243/normal_60421ccc4c7c7.pdf
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/taxovoguxanore_sagati_saxitasorowoti.pdf
    • https://supesitibozuxo.weebly.com/uploads/1/3/1/4/131454850/niwaladekif.pdf
    • https://cdn-cms.f-static.net/uploads/4387924/normal_60470a71d7663.pdf
    • https://cdn-cms.f-static.net/uploads/4471960/normal_5fd66126b41e3.pdf
    • https://xaledojasuk.weebly.com/uploads/1/3/0/9/130969600/koraba.pdf
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/jofiwolofajin.pdf
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5ff5d0ba2ceef.pdf
    • http://jakesubinosol.scienceontheweb.net/wudezexaduvanelezedimoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wovuluvoju.onlinewebshop.net/mathematical_modelling_textbook.pdf
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_90149143b3904ed39328d44a3b2e8e0f.pdf?index=true
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_4c42669f12c14d048a4a8a3ada432279.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_b0848a10ebd24fe7aad972b5da4d5d7b.pdf?index=true
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_9b2a8a7d9979480b853b344b8f3da79f.pdf?index=true
    • http://xobibaga.myartsonline.com/34309408917.pdf
    • http://nunavaxukozu.onlinewebshop.net/dictation_exercises_for_advanced_students.pdf
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_28d9784125fd435c89b9cd152247edd9.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_off0000ef2d.bin
6a3329e86a9adbd0c9500a945d2278ad3b2dfda643bf0c99bd1e330afd03693a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 5292 bytes
font_01_sfnt_off00010163.bin
97ff2a4e4315c55e1c4a7d0fde5c53e957ee92fbc21eb42890cc74f9938e1c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 11232 bytes

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