Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50c499788831761…

MALICIOUS

PDF

73.6 KB Created: 2020-12-28 20:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dbba79d27febdd8573e89e3cf17129a2 SHA-1: 94ebce111600b55e5e674c9caf75b9c5083f4cad SHA-256: a50c499788831761822a3c3e65e81a0b0db155153fe03d1a669c27765a36ebe9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external resources, many of which are hosted on disposable domains and identified as part of a link farm. One of the URLs is explicitly flagged as a known malicious redirector. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely intended to lead users to malicious content or phishing 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://traffmen.ru/aws?utm_term=breakup+pic+free In PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/nutapojuja.pdfIn PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/46b9c0d2f0.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/YgdATjc/la_novelita_roblox_id.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/hgT3ia2/cake_design_ideas_drawing.pdfIn PDF document text
    • https://fovubimosifiwu.weebly.com/uploads/1/3/4/3/134324820/jidivi.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/9352662.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/6ZGz0hf/rotokirewijefujufofof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_5f96136a15ba8.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/boguvike_jonanaboxu.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/pS5rSgf/70128578818.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/zatelogex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5fde87d061bc1.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/b06cb91e-62c2-4ac7-87c5-cfe9fcafea11/28088690523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396ed662-9bee-4099-ac71-d860e66f88f9/80517144502.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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 4912 bytes
SHA-256: 10eb188d1b05783e9dc567a3e04d3d55005f184e4eb6cb1b8fe25a5f3cbffb6e
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 11020 bytes
SHA-256: 0ecafa993e76815dc49a2e9a3b2eee0bc22c24d6a3fc4c8a9b5c970c0ac7064c

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