Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a6c1ad758ea26c…

MALICIOUS

PDF

84.8 KB Created: 2020-12-31 04:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f0f975361f93e6d23e384a61e00b13e3 SHA-1: e6c164fd0050d96b36240c69265017d4bae7052a SHA-256: f5a6c1ad758ea26cdb0e7fe01670999efed81b071b06c11ed2ab024169deb94c
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector URL (https://traffmen.ru/strik?utm_term=notepad+plus+plus+compare). The document body, though heavily obfuscated, suggests a lure related to software comparison, likely to trick users into downloading a payload or visiting a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=notepad+plus+plus+compare In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fbb31cb19730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5f94edbb9426d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f8c7dbb23d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_5fbade2e43ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5fc0cb7f069c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5fdb3a40313b8.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/78b75cafb371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_5fdc13a0e4ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_5fb2c3d1e696f.pdfIn PDF document text
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/gixikutunita_pegeratem.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/3797523.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/c79c22dc-6e6e-47a7-ba9f-59039be9c038/find_your_wings_lyrics.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_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 5188 bytes
SHA-256: 68d5bf2c58683865d47013a01c6ab972059b91cbf9df845ff06196f33275c282
font_01_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 10952 bytes
SHA-256: a0ff4bb51ad80ec24c1cba912c4af57878929fc0262d03162f0756516b1f7591

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