Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0c0feb1eae6cf4…

MALICIOUS

PDF

79.6 KB Created: 2021-03-17 05:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0635c690c9b929b761866b7c13d17f87 SHA-1: fab770de100b4803b5fd86c8fc597d5734cbc990 SHA-256: 4c0c0feb1eae6cf4fd88208f035db4b6b7dc7151324c66995fbe424f536ea8f7
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various domains, including disposable ones. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=movie+editor+apk+mod PDF link annotation
    • https://cdn.sqhk.co/vabalogu/cxthdgc/geopark_odsherred_cykellob_rute.pdfIn PDF document text
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/saliviseturomer.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/1100937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_5fd285ed13272.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/tezoputaweve-kobidopot-jitewozov-zamunebe.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/jFhbijl/big_shark_movies_list.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/giidn7D/80646371217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_602c9d6761594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_6049c4c774a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_6028fcf2372eb.pdfIn PDF document text
    • https://cdn.sqhk.co/dokamaruxif/hjiiUjg/forest_app_really_plant_trees.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_602a0551330a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601132da285bf.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/webilero-xokukoxega.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_28baf2342de549bdbfe09c0c0ab50d4c.pdf?index=trueIn PDF document text
    • http://duxuramubot.epizy.com/battery_percentage_apk_free.pdfIn PDF document text
    • http://veselawo.rf.gd/49125483718.pdfIn PDF document text
    • http://wesaxerofirivo.epizy.com/83606245530.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_f1b4f2f198664e0e8a9ba8f9d889793f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 4708 bytes
SHA-256: b97f91a1e1e5c1990470ba0ea0f793685b39bd71b65001c76d41031d0e2ad430
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10792 bytes
SHA-256: fb9f4827d9355d7e39208f8211a387bf8f7b7dbdc1036387cd11fcdec38d21bf
font_02_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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