Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cdb4de423c5bfd…

MALICIOUS

PDF

67.1 KB Created: 2020-11-12 20:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8a6c369c61f2a24a82f5ea15ae2eb0e2 SHA-1: 95c5a3acd0cc550ab50beb2aa70fb0fed5e84b4e SHA-256: d0cdb4de423c5bfd0d65e0b7fad4057437ab739b92ff88696d7c2a129928bc2a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=2005+chevy+silverado+2500hd+service+manual PDF link annotation
    • https://bavopubenexe.weebly.com/uploads/1/3/4/6/134678362/6dcdae2d2c984a.pdfIn PDF document text
    • https://denoxexulove.weebly.com/uploads/1/3/4/4/134457588/75d0d0cbe112.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/3591722.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/abee60c4ffd.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/mugiwex.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/3016824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8ab0dc2047a.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/butezodufigejitila.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/zikimenise.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/9386756.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/58ee0810-4f5e-43de-99f3-01ddd46a5889/gilidujosufobijoxubuzolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd2abaa-57ac-4e6b-b678-83b723875e65/rarowiweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb3f433-9365-48f1-8419-8f72829005d7/91385161686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929d3ff4-1845-46d2-81e7-b20a3cae73f8/molecular_hybridization_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a993e7-e1c5-4621-9fb9-c35277f1aeae/neditasimufarowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abb19e9-5e1d-42fd-b0ee-f59fc3ba87ab/xafefabevomowe.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_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 5644 bytes
SHA-256: c634521a39fa65fe28a3e5e7227d8080fd013f1fcb6331e477dc08bca6675e92
font_01_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 10800 bytes
SHA-256: 647d0f4f136774d3b7a060892b2327cd4590c9ade057ebb5dc3fce60f7c6b8d3

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