Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee8fd775b0fca2c…

MALICIOUS

PDF

83.6 KB Created: 2020-12-30 12:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85c9aeee46193bd9972ec1b2d774bea1 SHA-1: 759e541790f21a815fafa7fc451ef40cd1e85c75 SHA-256: 8ee8fd775b0fca2c4be61c653eb0894326f2869f60db12e9b5e8afe51273c6a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to malicious sites.

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-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://traffset.ru/strik?utm_term=igo+navigation+android+maps+download
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/551492.pdf
    • https://bugusurev.weebly.com/uploads/1/3/4/6/134615575/d069466.pdf
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5f9f739b71ffd.pdf
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/7989357.pdf
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fcfe6ed57254.pdf
    • https://cdn.sqhk.co/pufowuvikij/giQhdgc/64938694575.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5f9c764b72092.pdf
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/d02cfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4ed3a39b-d3c9-466e-804a-88dfcf918bd4/42726794610.pdf
    • https://uploads.strikinglycdn.com/files/ff9500ab-d407-4884-b438-3684705e46b8/tuzaxululavoladudifivosot.pdf
    • https://uploads.strikinglycdn.com/files/a444f77a-7d0d-4c85-b6ef-167c53c106f4/ac_delco_spark_plug_wire_application_chart.pdf
    • https://uploads.strikinglycdn.com/files/77f1c947-534d-42ca-8f38-842e917e2aea/zabafanavu.pdf
    • https://uploads.strikinglycdn.com/files/51369047-aa3e-4ef2-9762-bccc7f49983e/planting_puakenikeni_seeds.pdf
    • https://s3.amazonaws.com/lakadutof/community_banks_near_me.pdf
    • https://s3.amazonaws.com/mexijegedakol/little_rascals_english_movie_free.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_off0000fdcc.bin
81ad07d2d2b308f503639fe0ac58226b33d6b54f0961e1ef887d79a70dac1bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 5036 bytes
font_01_sfnt_off00010eda.bin
afc6359d809ff8f4576e5504f90c4a7bc5c500c1e8e5935c428a6f9cb5d5bb9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 10664 bytes
font_02_sfnt_off0001332e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1332E 4324 bytes

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