Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc762ba1d79eb9c…

MALICIOUS

PDF

78.5 KB Created: 2021-05-21 18:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71e9151a7563f8b35264bbc696e9fb62 SHA-1: 85e848b333d8241a987ffd3831f530c568fda88b SHA-256: 0bc762ba1d79eb9c02691746c824e9e80d47512a44f37c834fc9653d6d5d8eb1
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, indicating a phishing or trojan-like behavior. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or redirect users to malicious sites. The presence of an embedded URL further supports this, pointing to a potential phishing or malware distribution attempt.

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://ponafet.ru/wb?keyword=weber%20spirit%20ii%20e-310%20natural%20gas%20conversion%20kit
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/6486719.pdf
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/rotosok_sukejekozini_morap_zudureb.pdf
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/supigimanewekodipa.pdf
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/6423559.pdf
    • https://cdn-cms.f-static.net/uploads/4373770/normal_600df444aaad3.pdf
    • https://cdn-cms.f-static.net/uploads/4465390/normal_600e0b7d4182d.pdf
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/382298.pdf
    • https://razulusajo.weebly.com/uploads/1/3/4/4/134467314/3756685.pdf
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60698c404e7dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b8333aaf-d623-47b7-aba1-e64e5e6ebbcf/jotul_f500_reviews.pdf
    • https://uploads.strikinglycdn.com/files/40ceed5a-67ef-4bca-83f0-1703d19111bd/que_es_el_conocimiento_segun_aristoteles.pdf
    • https://uploads.strikinglycdn.com/files/a535240e-dc42-48ee-bf97-42f3d444895b/18646083683.pdf
    • https://s3.amazonaws.com/zunaporam/formal_gowns_for_hire_melbourne.pdf
    • https://s3.amazonaws.com/rujimidujek/74813744866.pdf
    • https://s3.amazonaws.com/puretulenuza/speaking_english_exercises_for_adults.pdf
    • https://uploads.strikinglycdn.com/files/917ced36-532b-4e14-afd3-114162e44c09/memevilubofipis.pdf
    • https://uploads.strikinglycdn.com/files/4bdecfab-ffef-4f9b-9225-6e917cbbf1a9/chuck_palahniuk_short_stories_guts.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_off0000f0c1.bin
41b7583c439c4a7ee86e060c16492628030c97998705dccd72e345729937e074		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 5768 bytes
font_01_sfnt_off00010495.bin
b5cebbf87d628854c717633220fbf87f89008e042112c3541adcb79f9f6c5d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 11852 bytes

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