Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4522575fd28ba9a…

MALICIOUS

PDF

86.3 KB Created: 2020-12-07 07:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 29ae023dfae38141bdfa241cbb67f8d8 SHA-1: bd7c4fb9ac4e4275a98fd096780089fd41e09aec SHA-256: c4522575fd28ba9ae119221eae3f8f03a5b7aea3d5992babb7294576809c5835
186 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 identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or distribution mechanism. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic indicate a likely attempt to manipulate search engine results or distribute malicious content.

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
  • 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://trafffi.ru/strik?utm_term=black+capped+chickadee+call PDF link annotation
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/3612640.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/9856044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f9295ac9d473.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/1a0fed6993bba31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_5fbb215d59149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_5fbf679b9bdf3.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/tadiga.pdfIn PDF document text
    • https://suzibosefibowu.weebly.com/uploads/1/3/4/8/134883218/bobefadegakile.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/fararaguze.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/zaxuledo/wumonoguxuluzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e440431e-46c8-4a58-9b99-dbe310baf497/62255763334.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/3332285536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71380f5c-b793-4970-80d5-dd75ff933dd4/us_government_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/flyer_templates_free_illustrator.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_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 5000 bytes
SHA-256: 857fee3a3625ebec74f8fdd51ccd15400bb8d59f394be4f1361646dc46f7ab7b
font_01_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 12324 bytes
SHA-256: ef7213b600874ce22729bb651f89fafa7883a1637043e1ddd826a1e9375dac7d

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