Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ccf3dfd5fd29dd…

MALICIOUS

PDF

69.3 KB Created: 2020-11-21 17:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: beb703dd0eb18093af262df109a00b8e SHA-1: d4f2a4c03ac0ed94d61b45ad3c3f73ed77f38e29 SHA-256: 87ccf3dfd5fd29dddd72ef25e408c93a60421374ea747d5f195d6a5723473d78
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 0.9997

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://traffnew.ru/123?utm_term=ride+trophy+guide PDF link annotation
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/3351729.pdfIn PDF document text
    • https://figotuzu.weebly.com/uploads/1/3/4/5/134579221/d4fbc9f4cff4a77.pdfIn PDF document text
    • https://lalemudisezevo.weebly.com/uploads/1/3/4/3/134359520/2670901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5fa087054e4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5f8eeaba62402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f9baf5f5c0d0.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/9a68af1d8a90.pdfIn PDF document text
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/vodulegotewatopipax.pdfIn PDF document text
    • https://busofixi.weebly.com/uploads/1/3/4/5/134576252/vudorijug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/vixibabotekov.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/avery_online_templates_5195.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_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 4912 bytes
SHA-256: c5d61ab1d52019026249b93c600799fc4b34aa12a7895e4112a1d9b1775c0ea6
font_01_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 11072 bytes
SHA-256: 750d900ca4b2e3a3e58506761de37f305c01c59771afc5a156093bcc0b7af8c8

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