Malicious PDF — malware analysis report

Static analysis result for SHA-256 74451d0b09123877…

MALICIOUS

PDF

86.3 KB Created: 2021-03-29 11:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef20d94df4ed0af378855a3380a82baa SHA-1: aeb0d1ec17fab1603f38c9d91143f401ecb1d4d3 SHA-256: 74451d0b09123877423f39f30f5009bf1e9b35cf77ed0a7a145ab1928a07b8c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://lozipotod.ru/award?keyword=applications+of+gis+in+civil+engineering+pdf', is flagged as a potential phishing or malware distribution point. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/award?keyword=applications+of+gis+in+civil+engineering+pdf
    • https://cdn-cms.f-static.net/uploads/4407789/normal_5fe9d2dbce160.pdf
    • https://cdn.sqhk.co/pazaxefuma/hf4dhjb/planet_impact_project_manager.pdf
    • https://cdn-cms.f-static.net/uploads/4476285/normal_5fea186b7aebd.pdf
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/4916365.pdf
    • https://cdn-cms.f-static.net/uploads/4370778/normal_602f0a21cf53e.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6017aa1933e53.pdf
    • https://cdn.sqhk.co/supesuvepo/igthaje/lupizubuwunefemukaxiwep.pdf
    • https://cdn.sqhk.co/toxotunem/haOheib/3d_model_construction_lego_car.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_6026508febdb7.pdf
    • https://cdn.sqhk.co/vovawumusa/esNa5Gc/download_vpn_private_premium_mod_apk.pdf
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/25b5bbac185.pdf
    • https://cdn-cms.f-static.net/uploads/4529087/normal_5fd5f4674d87c.pdf
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/gulolug.pdf
    • https://nufulukoveta.weebly.com/uploads/1/3/4/7/134700555/6521204.pdf
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5ffffe3810bba.pdf
    • https://cdn.sqhk.co/lowixadoges/awk47zz/43490338634.pdf
    • https://lekomitigukajar.weebly.com/uploads/1/3/5/3/135345412/judadezexeser.pdf
    • https://static.s123-cdn-static.com/uploads/4404730/normal_6003a4deba5d0.pdf
    • https://cdn-cms.f-static.net/uploads/4485005/normal_603552263a262.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_74e05d1e755243a4a0fbab0d616be52b.pdf?index=true
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_9396bfb075ce4cedbaa965d38a95e6b6.pdf?index=true
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_1937147b22fc4968b7469d935325e5b7.pdf?index=true
    • https://s3.amazonaws.com/fekife/the_amazing_power_of_deliberate_intent_free_download.pdf
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_6b27d29a72934877927eadd57038981e.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/hp_g62_laptop_motherboard_replacement.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_off0001157e.bin
2dd0b02b747807878cbb7158d796441b9d22296a86a1d21ea174c70862e225e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 5372 bytes
font_01_sfnt_off000127de.bin
a39d8beb6f559a491b36d236a34b68db41e1bf351a2b215e8f74ee42dfdc9f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 10448 bytes

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