Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7762129baf8c5f…

MALICIOUS

PDF

80.8 KB Created: 2020-12-20 13:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 950230b50a338acb9b79319f440d4f3a SHA-1: db41bd298b91d1f95e4315519619cc4075e36e41 SHA-256: 8e7762129baf8c5f1b13590d432a27628a40e700697d7a5bea8e2dff09f74eae
156 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 0.9997

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
  • 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.
  • 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://trafficel.ru/strik?utm_term=tia+and+tamera+parents+and+siblings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5fddf46b243b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5fcef55c4dfda.pdfIn PDF document text
    • https://lakozudixe.weebly.com/uploads/1/3/4/7/134704846/napudizeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_5fa6eaab92a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fb2dd5948213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f9715d4b77ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_5fa4ab652e922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_5fa28c956ce1b.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/naponekejaviguz.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/aa9e3523-bad2-4eb7-9d11-dbc549a216db/timozexex.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/biomass_definition_energy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36350d6f-3043-46dd-9f5b-ddc042bf159a/solasur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c0d902-4f21-4488-8dd2-97deeef50869/66659451074.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/public_relations_strategies.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5368 bytes
SHA-256: c1b61468c81f365152a637ebb9f44c6c507ef3032116712a29b30b49e20f6534
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10196 bytes
SHA-256: 669cc9ca3e801ae01e5c8c116cbe3009ba2e4989bd1812e52e07d4912950f07f
font_02_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 17632 bytes
SHA-256: 9f7968a3cb204c3384178f867d6a2099820487d5840fe8174f6f4bec101b2ddc

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