Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a833738055b145e…

MALICIOUS

PDF

62.5 KB Created: 2020-12-29 21:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3f771b0afcd6968b1302c41c7f9f97da SHA-1: 05c12cc4e60f2ba70f08a721761d2982da9e7643 SHA-256: 2a833738055b145e33c8de29b29434edd0f96062f26b8be9825420ebf225103b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure and a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links, many hosted on disposable domains, suggests a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/123?utm_term=woodriver+clamp+guide+universal+base In PDF document text
    • https://cdn.sqhk.co/kagelemovo/9gTkeid/tivowowivarasov.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/8652378.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/ruwekipe.pdfIn PDF document text
    • https://lowowoponifiva.weebly.com/uploads/1/3/4/8/134872311/zopogujak-sabukila-firajusuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fc6df3e40d38.pdfIn PDF document text
    • https://bexatumabe.weebly.com/uploads/1/3/4/8/134852132/xomotina_jixenubogo.pdfIn PDF document text
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/vofazoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5f8a92211c87c.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/WNY9yHe/xitididepuxixu.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/pasawexawinogad/blufftitler_intro_templates.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_off0000b707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB707 5604 bytes
SHA-256: a18ad49f5c8a4fcac78e5f027434dd666d4e37c190a8c5db6f23c297939ab539
font_01_sfnt_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 10404 bytes
SHA-256: 1dc0c53b773257da3e783c6675ad92a3bba5b5e548a2b8ae70e0c4626f8e429a

Open this report in the interactive analyzer, or submit your own file for analysis.