Malicious PDF — malware analysis report

Static analysis result for SHA-256 d932c800a8a930ab…

MALICIOUS

PDF

81.0 KB Created: 2020-11-25 18:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5d9d5b8e42b6d9d4bef60f286019f52a SHA-1: 98f3f0665241953c59c1e2f8b0bd2c0ff4c035ae SHA-256: d932c800a8a930ab3691e2492cea9782b57e94fdc805a2772ec3db7b75476504
214 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 links, identified as a link farm, directing users to potentially malicious websites. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=maladolescenza+full+movie+online+free+123 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f8b1e9c6e0ef.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/9a2b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5f8d0ddea7bc8.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/280700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5fb024f120a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_5fafec32e4290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fbc935430775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5f93179092db8.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/59cda7ec6dd.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/divelatoxa/xiwirakopelafon.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/aluminium_die_casting_defects.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_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 5628 bytes
SHA-256: bf67725f8468c757c6710a988ff065fbac9cc6618955a081979153fee044e941
font_01_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 10552 bytes
SHA-256: 5a45bfe74daf296dc06a97fdcb4da2e69d01c6a197b090bc96c283532d603ffe

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