Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f056d04125dc23…

MALICIOUS

PDF

85.8 KB Created: 2021-01-31 03:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ccb8f45b1ea6e754ca98c2e61c372508 SHA-1: 09e908dc133525ae75b7993da2e4c5d19e50c276 SHA-256: c1f056d04125dc238d72a71489a862145c4745978d0e30e817475457da298448
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to the document's primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/aws?utm_term=bowel+preparation+guidelines+malaysia PDF link annotation
    • https://zakazorexan.weebly.com/uploads/1/3/1/4/131407051/bufiruregov.pdfIn PDF document text
    • http://znalomstvavip.site/manga_avatar_creator_onlineuvncl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5fccffb6173af.pdfIn PDF document text
    • http://price-list.moscow/loregivokawedulxij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495975/normal_6003bc9f840c9.pdfIn PDF document text
    • https://ruzopujiwinor.weebly.com/uploads/1/3/1/4/131452977/8897090.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/jalopesa-lefivowag-juxusurufufofi-jufefurunubam.pdfIn PDF document text
    • http://zakofuta.66ghz.com/bezegudegap.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/zasoza.pdfIn PDF document text
    • https://jibozugapizame.weebly.com/uploads/1/3/0/7/130775201/ac9ac30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fef89c36bf59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buwosevax/vehicle_accident_report_abu_dhabi.pdfIn PDF document text
    • http://kazaxese.epizy.com/45842328113.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/sheetz_food_menu_calories.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/58192210042.pdfIn PDF document text
    • http://nekogepi.epizy.com/up._jawbone._com_app_for_android.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_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 5524 bytes
SHA-256: 81bcd58cfdec3a78ff074596582ef6dc6a6a47e569020db44a223f325f800dc9
font_01_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 12092 bytes
SHA-256: dc073ba56b427c53a173b1858d35d9783d52d2756e7471bc4a6b3a33b054e1df

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