Malicious PDF — malware analysis report

Static analysis result for SHA-256 6429b1cc617647b7…

MALICIOUS

PDF

68.8 KB Created: 2021-01-31 21:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5a98874c8f5d2ad568ba3b96e132685c SHA-1: eedd33c34393b200c3fc5d6ebbc36df4f3b2a189 SHA-256: 6429b1cc617647b7e005f6d083bd977ae2f0b7e1967b0e14e8e8e236f1dca229
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to potentially harmful sites.

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://bologen.ru/123?utm_term=cave+crawler+osrs+cannon PDF link annotation
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/jededakegugap.pdfIn PDF document text
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/zofipowol.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/xibafuwemubabupikut.pdfIn PDF document text
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/sabukadin.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/L6jccWW/74305134829.pdfIn PDF document text
    • https://muwivagejexe.weebly.com/uploads/1/3/1/3/131379070/nesozipilomagut.pdfIn PDF document text
    • http://thefortykuti.com/clash_of_clans_apk_day_20205ofuw.pdfIn PDF document text
    • http://rafale.store/fugetaketaz7dvv.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/kipalaranelekevufur.pdfIn PDF document text
    • http://zaxunux.iblogger.org/4550694422.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/e70a7ce2.pdfIn PDF document text
    • http://vienvozvrat.site/kikesimisuvokujuff3cs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwojojerat.rf.gd/88674354157.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/zuvibikadegodunujabafu.pdfIn PDF document text
    • http://pifutujotot.epizy.com/como_atualizar_android_j7_pro.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/causes_of_deforestation_in_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/fetemelavod.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/96528116209.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 4852 bytes
SHA-256: 9001c9450098bc4e58a6fbc5da10dec5d3773c8b9901ac120c75bffe34c0c487
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 10256 bytes
SHA-256: 3a6fbe043abf8c6b34f576a60d12d51ca03ea2302f0129c8f68fe35a870f1fd7

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