Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13ef270cc7c1f9a…

MALICIOUS

PDF

87.3 KB Created: 2021-02-10 18:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 613e7db638206e3f4bbe045e443e5205 SHA-1: 2e9e6ff934b2c8c692082f6b001b915cdda46897 SHA-256: a13ef270cc7c1f9a2fa1c8af49dc3d7a25348abbf29151fd175982ece78c5871
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=jonsered+52e+parts+lookup PDF link annotation
    • https://cdn.sqhk.co/kutupejotige/i2Syqhm/digital_scholastic_bookflix_login.pdfIn PDF document text
    • http://tiktokhd.design/xonuletufaluqg0ie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5fe2bcbcdfaad.pdfIn PDF document text
    • http://bokevefinobi.iblogger.org/the_amazing_spider_man_2_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/Oieiggg/space_frontier_planete.pdfIn PDF document text
    • http://gooddevice-online.com/14269892809ax8bj.pdfIn PDF document text
    • http://dapabikokewe.iblogger.org/cancellation_letter_template.pdfIn PDF document text
    • http://zhigina.ru/59634080404l2y03.pdfIn PDF document text
    • https://cdn.sqhk.co/pajugeluj/EcjhMgh/16740685504.pdfIn PDF document text
    • http://help-bluebadgecenter.com/45690330298px8b9.pdfIn PDF document text
    • http://freud.icu/fidusol44tjq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374710/normal_5fcc8b95535fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatapusaf.rf.gd/6371362398.pdfIn PDF document text
    • http://putiweg.epizy.com/chilling_reads_to_look_out_for_answers.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_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 5260 bytes
SHA-256: b83a317ae7aefa48bd612257a06775956f91cd5d2e9b988e871e46e21e07e285
font_01_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 11344 bytes
SHA-256: 1bb5744b75eacf7adf508e7b47d75f9131fc8e0c7dd1607f3fc77006d1ca88d8

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