Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3958de6e82887b…

MALICIOUS

PDF

58.0 KB Created: 2020-11-10 01:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 396801b7ced84654039c1c46475772cb SHA-1: 83279b1c39ce923a5c515b4a70aa6a9d803ada07 SHA-256: 7a3958de6e82887baf399eae4d837606c4cdff7f27695ac6514ec130fc5bb4d4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/strik?keyword=prince+of+war+armor+games PDF link annotation
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/5387279.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/motimi.pdfIn PDF document text
    • https://koxubabu.weebly.com/uploads/1/3/4/3/134314291/a4a532478cdc33f.pdfIn PDF document text
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/ab527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420617/normal_5f990cb9cda7b.pdfIn PDF document text
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/vugedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5f974bc5cd33c.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/bezorito/bipap_vision_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ad3415-d5d9-4a22-9f90-696e49a66d5c/manitowoc_ud_0140a_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/study_of_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c1297e-4709-4277-8014-9a56d60be1fc/93550007399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cad19d-e924-45be-b712-df0205b5fdfa/30038170428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba16d4f-43e8-43c2-98c0-5fd51967a9ae/gagibuziromi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6816f923-4154-49f1-ac93-59aec42d5283/98974285936.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_off0000a890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA890 5264 bytes
SHA-256: c1fbc7137be12b6613e57be6fc8966cc795f3e953f6f39a56ad69d8852ae855c
font_01_sfnt_off0000ba78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 9744 bytes
SHA-256: 1b80b5a6374932261045c59d4b817ad5b0c85a0fc40cf39f57f54169c1dd0119

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