Malicious PDF — malware analysis report

Static analysis result for SHA-256 660230a59a70858b…

MALICIOUS

PDF

67.9 KB Created: 2020-12-20 05:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4f5ef23831f9ac14de474adc8d711c98 SHA-1: 91289a91c06422b737597a69f2424e40fa388a41 SHA-256: 660230a59a70858bef65c76abc7612842a06b20eee9fb2b42982513ac269b017
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to 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
  • 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://gettraff.ru/strik?utm_term=to+be+verbs+replacements In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5fd9a0cb72674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fae2aa3bba22.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3079835.pdfIn PDF document text
    • https://zinuwikisabarek.weebly.com/uploads/1/3/4/6/134679236/bdebb835bb6.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/werijulofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_5fb8845c3bffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_5faaa50569e8a.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/3016033.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/xisuj-somulomexuji.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/rolefosiju/caecilia_lt_std_light_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/44983599068.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc592a72e34347c706420e1/t/5fcd278105ddc9599d2a5bca/1607280514926/334475776.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56a0368612547ed7c4422/t/5fd0f914fef94d69d4977a4d/1607530773126/doom_patrol_trailer_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/ballade_chopin_4.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_off0000ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 5228 bytes
SHA-256: 9b2f7e3048151b73773b31ec2f507d325dc1ca7e74f1f95acf751fd57d03948c
font_01_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 10080 bytes
SHA-256: 8977a8166037d5875ffaba806c0ab791bd1af446a511485f6e6e3b47e7b0d4a4

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