Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dabf58d9ed01222…

MALICIOUS

PDF

70.5 KB Created: 2020-11-20 08:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 24d9230f7a30b7b8297a14a41db50ed1 SHA-1: 216e4efc9aa2eb2a644c2ccfd1e3d7acc0c3671c SHA-256: 4dabf58d9ed012226f5289bfba41348465b8d36e78a246df602924dcdf630ec2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=download+youmans+neurosurgery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f9c68418c3f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5faad6e2811c3.pdfIn PDF document text
    • https://vugilove.weebly.com/uploads/1/3/4/2/134234765/6072567.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/vawetukujeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f8e8fd6242e6.pdfIn PDF document text
    • https://gikudinok.weebly.com/uploads/1/3/4/7/134730402/5e724f1bc994.pdfIn PDF document text
    • https://poxedavuk.weebly.com/uploads/1/3/4/6/134608045/vanil_tumojewelulepe.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/ketimoralekox.pdfIn PDF document text
    • https://zowutopukanujim.weebly.com/uploads/1/3/4/2/134235103/9f2339.pdfIn PDF document text
    • https://nodemexawek.weebly.com/uploads/1/3/4/3/134331915/057cd.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/a359a71f-25ae-4a09-8380-3c7af4ef9105/vuberimawipexela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe745459-2e8a-4e17-a6b3-30a2e3267478/cereal_meme_face.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c62ca28-30db-4be7-af68-3bf2c718031c/wokaxutobajofezaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938ee603-8dcd-485d-bdc1-b6307ee8f3ba/old_sears_sewing_machine_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fafeb7-8164-4e61-babd-620a08291e30/gemilidonatenixi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 5336 bytes
SHA-256: 8338edaa19bbc39f2f8fcc8792190025ce6e9d230e8069109e40488deef5c2dc
font_01_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 10072 bytes
SHA-256: fff486f5e9f889d60a12c867dfe1c5250610df8c8051fd8783dd1d7faf007dc2
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16136 bytes
SHA-256: f02463b4397c48dcacc6d7b6e496cab08184ec3446a0dfeb8d117c87f4868123

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