Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a257ab00d2b6d91…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 05:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0551155ea63935adbf31bdecf0967b4d SHA-1: dba5e91fe1f831ab4db024b5f31f7d7437157a9e SHA-256: 0a257ab00d2b6d916b463a2413cf5a4402b548a2101825e84e8f854eef8b79a7
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains text related to 'celebrity news', a common lure for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=latest+naija+celebrity+news+today In PDF document text
    • http://nowukusox.mypressonline.com/rotopuforova.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/52169131437.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/hi8gdsV/56764645787.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/icibnYs/20841110961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_5fe9fab88d266.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/yhjjhRp/34488463915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_601a641cd0626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_6003d42c6bf7d.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/34169212777.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/8020d0.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/dulowan.pdfIn PDF document text
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/lovoxepupufuzokaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nujamuxeg/jjfT7Kn/92872381841.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/remington_bolt_action_black_powder_rifle.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/hbe8idw/farm_village_2_game_free_download.pdfIn PDF document text
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/5383506.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/1076625.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokazote.rf.gd/how_much_does_it_cost_to_send_registered_mail_internationally.pdfIn PDF document text
    • http://kagapari.rf.gd/roxosixipowi.pdfIn PDF document text
    • http://jibaberumakome.rf.gd/nudat.pdfIn PDF document text
    • http://juwebud.epizy.com/jolijalo.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_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 5284 bytes
SHA-256: ab07f0130c0bcad4493625278a54d15d5998caf8d53bc50bc6b811259fa3a444
font_01_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 11424 bytes
SHA-256: ab0a29dda9230527eb09acd9ad77bedb929339d4a1290c423246220ec72c347d

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