Malicious PDF — malware analysis report

Static analysis result for SHA-256 371013fbadcab433…

MALICIOUS

PDF

71.9 KB Created: 2020-12-16 07:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1053cdb4af6561381322680e154ac34 SHA-1: 19507133cfd0f6b765fa5849a1d332bc56f94e6a SHA-256: 371013fbadcab43306f0817ea2874b941fa4fccffad5bfc4ce48946b1ea65434
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable or associated with link farms. One critical heuristic identified links to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and ClamAV detected it as a phishing trojan. While no scripts were extracted, the document's structure and embedded URLs suggest it's part of a campaign to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffine.ru/strik?utm_term=india+eu+trade+pact In PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/dubogisimeza.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/fbc09e4.pdfIn PDF document text
    • https://kemolarutu.weebly.com/uploads/1/3/4/6/134685450/405128.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/705999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f97aafb8eb6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5fd968f81fe78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_5f98504feb4bb.pdfIn PDF document text
    • https://pomawuro.weebly.com/uploads/1/3/4/3/134368023/sukel-fogidenunib-didatimi.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/d4aeabd7-63db-4377-8b38-712532d8cf78/levijaxum.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/after_death_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fbd44a-f505-42c5-bf52-06dae4ab165e/torrents_filmi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1fd1de1-f82a-4d84-8e61-fdadc5be001d/motocard_andorra_capacetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46439d9b-69b3-46ad-895b-35e7b324504e/6_1.5_v_battery.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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 4792 bytes
SHA-256: fd46e9563d78c363a477556dd3609fe5d6888818f64a9d6f1acdce5001f991c6
font_01_sfnt_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 11552 bytes
SHA-256: eccde7e7c4977bd7b71e2634f9cd7f95d6b46ac4c8df359eb21537456fb20d8a

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