Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f4f346eedf6b94…

MALICIOUS

PDF

75.8 KB Created: 2020-11-24 04:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bab15b08880faf2635250e1c8f940394 SHA-1: 4a5ba63eef063273cb3bf7e764cebf7dca0bea2c SHA-256: 50f4f346eedf6b9481956fd117c6e8cec8969e1ddd207ba6cc91d29866417b0d
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by multiple heuristics as a redirector for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=fallout+4+holy+mission+congregation In 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/2f299039-5c82-466e-a579-17ad27fe12f9/apostila_de_anatomia_e_fisiologia_humana_para_tecnico_de_enfermagem.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/tawoxitekazinavusuzuber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad2833a-b762-4b51-8463-36acd50893c3/kaxexuxuwof.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/67256836230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd39b3a-8138-4f3e-9b2a-43547de3f0f9/nikunazuguxe.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/beginning_and_ending_sounds_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179fd2f4-3438-4ab8-8ef7-672d6f9ef3a5/segoniwasikim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0e7950-dada-44cd-9605-5dc43e550562/5505395112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c12e4c-7b5a-402d-b024-78b5a6db38d8/ripafavafabetupomataju.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/28749004822.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 5360 bytes
SHA-256: 914d2fc5c3d6ff39d8f59c92cc15865487ac0c12451f3247ef3dc183bce642a7
font_02_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 11492 bytes
SHA-256: 41aa62e558860be3601f4c240785d62f1c789d87df8e919f1f7b0d47be5d2a3b
font_03_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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