Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd382d596cb82fe…

MALICIOUS

PDF

67.1 KB Created: 2020-11-24 21:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 25f7323d8007a5829ed7d0aea6546c61 SHA-1: 1a7aaeefece68aebb2ef4b91d01ac2be53d32d28 SHA-256: 5dd382d596cb82feccdf4a2c40b8e79e24c2b0dbf27f8217efb8ca60703d9522
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and an ML classifier identified this file as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=wiccan+prayers+pdf PDF link annotation
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/dbd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87599ef1578.pdfIn PDF document text
    • https://fatuzolawodazu.weebly.com/uploads/1/3/4/7/134730183/1726761.pdfIn PDF document text
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/ladisox-welijibidexo-donojexaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_5fba61815fc60.pdfIn PDF document text
    • https://kobisizosupo.weebly.com/uploads/1/3/4/3/134316778/galixura.pdfIn PDF document text
    • https://pibofarijefi.weebly.com/uploads/1/3/4/6/134648305/2676306.pdfIn PDF document text
    • https://roderisagewap.weebly.com/uploads/1/3/4/5/134507489/94fa86151f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_5f965223cd9f0.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/9a07ca04-746d-4c49-a14a-47f3ade29840/bitatobob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d791cfff-0553-446c-915c-a3bf8a849025/victory_motorcycle_salvage_parts.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 5232 bytes
SHA-256: 50b8de2c50ab878ab59b1deed5a143f921cce13525d8a414ee54ed8e5fd2e3e7
font_01_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 9844 bytes
SHA-256: e8d5aa86d8137d0d84d94bc21f6a03bbc6ae649f70f28930aca84f17fd780dd3

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