Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1603fd969e9efb…

MALICIOUS

PDF

69.5 KB Created: 2021-02-14 05:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fc4c6dde8e62f006d16fb1846394a8b0 SHA-1: e0d63b04aacbaaf32e489dceb6d53e9daab8ae94 SHA-256: 8f1603fd969e9efb305fe8df7d91073874771bc266a78db1fae899e41398813b
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (https://yafferge.ru/). The document body, though heavily obfuscated, appears to contain keywords related to popular media, suggesting a lure to disguise the malicious links. The presence of multiple disposable domains and link farms further indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wb?keyword=baahubali%202%20tamil%20movie%20%20masstamilan In PDF document text
    • http://autoport76.online/copper_sheet_splashback_ukr6ibw.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/Mgdjgid/21638743124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcaf55915185.pdfIn PDF document text
    • http://nonly.xyz/sintesis_de_auxinas98ot2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_601f46e599213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_602088a339817.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/49030091995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6019a734b4931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_60219c7379e09.pdfIn PDF document text
    • http://tersq.space/fortnitemares_challenges_cheat_sheet_chapter_2do1dh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawofepak.epizy.com/boderozanuselejorefotas.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/61831472451.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/manual_aerosol_filling_machine.pdfIn PDF document text
    • http://xuresiru.epizy.com/jalow.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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 5212 bytes
SHA-256: ee4ced38ee95becd385d43e6df8de24899c0c944d1879d1ca0e504b5b1bfee9d
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 10580 bytes
SHA-256: c1a926ffd489d39073502c72e787f36d8fbe79a8a9528189bc4447b6623e4035

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