Malicious PDF — malware analysis report

Static analysis result for SHA-256 1765f4cdfaabd71d…

MALICIOUS

PDF

73.7 KB Created: 2021-01-03 20:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 45db2ad34767d0740d5045fa41751ae8 SHA-1: 6a9b335e3b2cb9e9f507efca64258701304e2e63 SHA-256: 1765f4cdfaabd71df775380b514c2392de305af33f88a63658b4ccdf12634656
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files, many hosted on disposable domains. The primary heuristic 'PDF_SEO_LINK_FARM' suggests a large number of external links, likely intended to manipulate search engine results or distribute further malicious content. The presence of a URL with a 'utm_term' parameter further supports the idea of a campaign or tracking mechanism.

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://traffking.ru/123?utm_term=word+families+list+advanced PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5f97fc8f3e23c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f94791c8795f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_5fdfa71a16f44.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/9091413.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/7e2218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fae577519e0e.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/gugafulevikagoluji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379384/normal_5fe2dc3ce99d1.pdfIn PDF document text
    • https://kagixopobexumel.weebly.com/uploads/1/3/4/6/134648921/raminusalefalepeluze.pdfIn PDF document text
    • https://duvonejubuzal.weebly.com/uploads/1/3/4/3/134321315/gajuvojazixadapoti.pdfIn PDF document text
    • https://velolabojenap.weebly.com/uploads/1/3/4/5/134525374/puxosibe_rekudikikawoja_gujoxeronexaki_zezizivaru.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/iXiaibB/devivovizojenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb7099d-9cd6-48e2-aa99-c7c75c0f6221/40555288137.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/33213896952.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 5240 bytes
SHA-256: e2f50dc311b1e1f9e437f472249e82bc72d857cf124951caee43272eec9db112
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 11048 bytes
SHA-256: f393777102d656a5c4fc034b7ef7849bcd2bce3044283f762cc2bf237e2f4656

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