Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6492e364f88a7e9…

MALICIOUS

PDF

83.4 KB Created: 2020-12-26 22:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d3aa03110d31b1caaea710fab2148d25 SHA-1: 9297196ff8961c6b477df2ee43813dae647c27f7 SHA-256: b6492e364f88a7e98262015186dabd248821f237141cea18283d723a120ac13c
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 hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious websites, likely for malware distribution or credential harvesting.

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://traffset.ru/aws?utm_term=biostar+2+device+sdk PDF link annotation
    • https://cdn.sqhk.co/bitubebo/ihdJgjm/nebomedoneju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8e7f66c3936.pdfIn PDF document text
    • https://pesawesezopi.weebly.com/uploads/1/3/4/3/134327800/1701827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fd5f323ad311.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/Zghgigj/real_gangster_grand_city_crime_simulator_mod_apk.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/tejebabeni-nesevofowafejo-gulufasobeger.pdfIn PDF document text
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/3473370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5f8c2c2dc21ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_5fae4a2983187.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/idgeJhf/3371450679.pdfIn PDF document text
    • https://nigupisotaku.weebly.com/uploads/1/3/4/3/134374455/8827605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5fbcaae39c617.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/gazijewevan/86006081037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1084cb-74bd-4905-a5e6-ba4552263932/vizio_e70-_c3_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 5208 bytes
SHA-256: a96400d623f9a09f841472d5bcbdf5fa7f0165e2622f10f1e69d3bad135d5b8d
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 10868 bytes
SHA-256: 119dfc8f857a6842464d103d6dd1882b00d9b7153dc0b5917efe0910057305c8

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