Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b74ab24fe6431e…

MALICIOUS

PDF

75.1 KB Created: 2021-02-17 11:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3cc5d59b23e34ba7ac64d312770cf058 SHA-1: 2dee6c3094b1e80f2eee103e2459375b995c9d69 SHA-256: 39b74ab24fe6431e96a88c6ef3fdea628a608bbbaa6e128a66562e07392c897e
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with several heuristics indicating a link farm designed to redirect users to external sites. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=pet+sematary+2019+wendigo In PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/wunabupabizapatokema.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/hdTtigH/34171740531.pdfIn PDF document text
    • http://wimedibateguj.22web.org/what_are_p_type_and_n_type_semiconductor.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/accc5a2117.pdfIn PDF document text
    • https://zokuvulasaxibu.weebly.com/uploads/1/3/5/2/135298812/8d1eb464.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/jgi2je8/smart_launcher_5_pro_price.pdfIn PDF document text
    • http://didavixakodix.22web.org/fisivurasijolidevatefuz.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/PppKijX/my_talking_monkey_cartoon.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/9098803.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/jKJFwgc/xapezerodevores.pdfIn PDF document text
    • http://fulilip.iblogger.org/31548611009.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/c395Zgc/46485471675.pdfIn PDF document text
    • http://rakuwotakiko.22web.org/mumanulapimok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagupugizof.epizy.com/advanced_life_support_manual_7th_edition.pdfIn PDF document text
    • http://wadekazu.epizy.com/gaxorovekizudaxajeges.pdfIn PDF document text
    • http://pebulibupa.rf.gd/sajebunidalesoseropod.pdfIn PDF document text
    • http://sozotipopesez.rf.gd/set_associative_mapping.pdfIn PDF document text
    • http://refipazak.epizy.com/sosedekeberuvopegigorovod.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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 5792 bytes
SHA-256: b022558e2a2235154f88f4fedd0a7e2eeb1ae17560e5b5cbb6cd2411d4b1b18f
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10884 bytes
SHA-256: 6a71952933f49f00b5586186628a1758854f42ba960bdb949cbfd759c41f36ae

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