Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a64c12e610494cc…

MALICIOUS

PDF

90.7 KB Created: 2021-02-28 18:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2554c5bd975233dd9543c3fa65b2ff7b SHA-1: 8ce4fc9207476feee709bfa2b768b72872b58c39 SHA-256: 8a64c12e610494cc02d7abb73d13eb7edb75cad3d35d06781565ce2a37e1f433
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://dugedepap.ru/wix?keyword=identify+science+lab+equipment+worksheet PDF link annotation
    • http://itrom.fun/508396973694fp1x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_6028189e3a0fd.pdfIn PDF document text
    • http://ryursew.space/black_christmas_ornaments_glassfc4lr.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/Nfidjax/geometry_dash_rush_e.pdfIn PDF document text
    • https://zinenefubodejig.weebly.com/uploads/1/3/4/3/134338026/jilimurifodem-taniwufegusetin-zasuxevupiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_601b7b675fe21.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/gcicecP/borovezi.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/P2AheyT/wood_cutting_saw_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/WMBy7jb/95356257151.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/gdJgdcr/lidatezuzikibuki.pdfIn PDF document text
    • http://summ-green.fun/learn_macedonian_language6m8lu.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/eqhhfjf/heroes_evolved_characters.pdfIn PDF document text
    • http://erogan24.website/origami_foldable_bookshelfkrhnu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 5856 bytes
SHA-256: 818e0ec2342b10fa8f5b9e8ccbbd05168f5bfe480e3fc30744d3789b8829abdb
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 14508 bytes
SHA-256: 2d3d0f7792e220bc556d274b2734badd27585e7e1a522bea479d932206f9668a
font_02_sfnt_off0001486f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486F 16160 bytes
SHA-256: 9ffc405fbed68b1ed35cf25504b2a045b5802e2074cf99e6920a228075e829fc

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