Malicious PDF — malware analysis report

Static analysis result for SHA-256 736c43e1702b9625…

MALICIOUS

PDF

80.9 KB Created: 2021-05-29 04:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0461f0f35bfd9d85ba34907cb6cdafbd SHA-1: 4bffa4264e26bb1d3491879e39eaa01ea4a36a1b SHA-256: 736c43e1702b962579e6f23ae07f487f930789a89c9246124f96b5cd56198e1d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO spam operation. The primary URL, 'https://golowaki.ru/wb?keyword=cuantos%20milimetros%20tiene%20un%20metro', indicates a lure to a search result page. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://golowaki.ru/wb?keyword=cuantos%20milimetros%20tiene%20un%20metro
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5ff6363bdc319.pdf
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/novutevelonusivij.pdf
    • https://rusofejez.weebly.com/uploads/1/3/1/8/131856127/581a7867439ebc.pdf
    • https://cdn-cms.f-static.net/uploads/4499341/normal_6025b7c8244ab.pdf
    • https://cdn-cms.f-static.net/uploads/4497369/normal_60419cbcebb76.pdf
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fcf2b9f4a9e9.pdf
    • https://bivibonade.weebly.com/uploads/1/3/4/0/134041173/3006601.pdf
    • https://bogatawokajo.weebly.com/uploads/1/3/4/9/134900502/5976047.pdf
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ff2e594c906b.pdf
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/3540295.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602d41b81db9e.pdf
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5ff4c2144950e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3986740c-8cb5-422b-98bc-1c211fa7a987/oh_llama_de_amor_viva_analisis.pdf
    • https://uploads.strikinglycdn.com/files/5d040292-ef3d-4317-8c2e-6dd321159392/english_grammar_past_tenses_exercises_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/3a031bc3-352e-45b7-8168-73471aa2fe21/how_powerful_your_mind_is.pdf
    • https://uploads.strikinglycdn.com/files/c5c2ff47-0ca7-4d0e-afc6-eda817bcc36c/what_age_is_the_trials_of_apollo_for.pdf
    • https://uploads.strikinglycdn.com/files/ea9288f0-1be2-4672-b6c8-07bd73f9b759/69425902037.pdf
    • https://uploads.strikinglycdn.com/files/ea59d102-db22-4216-b9cd-667800880d2f/wodozuguvumugibibol.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_off0000fc30.bin
090a9412cced0188cc8691a81fabb70c5f3debab34a0ffd984cd22b4a73e3060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 4736 bytes
font_01_sfnt_off00010c26.bin
55ea2c0ac4888d14e9d898e45d9fd43954288fdd135160359707157e561a435f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 12412 bytes

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