Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1bdab38e239675…

MALICIOUS

PDF

70.9 KB Created: 2021-01-07 20:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5981001f2ae879766eccd52a8ac719f5 SHA-1: ce9e04578e938c6ffa118f152752454c4152f4ff SHA-256: dd1bdab38e239675ae2054af9b9274c041fd60e528fd5b64455b89b9b26cb362
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://gettraff.ru/123?utm_term=vcenter+ports+and+protocols`. The presence of many external PDF links suggests a link farm or phishing attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=vcenter+ports+and+protocols In PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fc68df687c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_5f94a3278d2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f87433f7bac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_5fbe10bdca581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5f92c8a2217f3.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/matexoxipanemazi.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/5778968.pdfIn PDF document text
    • https://damasixo.weebly.com/uploads/1/3/5/3/135322107/ad98705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_5fedc259b6932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489979/normal_5fee9995cad39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ninazarila/tower_defence_5_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa39782-c7e8-4713-9dec-17e088f72cb7/recover_deleted_files_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/2_day_guided_tours_in_iceland.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

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 4772 bytes
SHA-256: a442a7e9a990950caeb1966c4ccd1748877193aa8e1a8bfc6271738a96019928
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 10352 bytes
SHA-256: 27dc417c5b4a4fc5c6075f84cfc8c524c84fbcbd147c464a24365d4a850e3279
font_02_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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