Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da7668691cbe5ff…

MALICIOUS

PDF

78.5 KB Created: 2021-02-04 07:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe741d5172c7725f16099213f6af071a SHA-1: 983d16c2f59f0cf476baaa9b865b62c0e8adf6c0 SHA-256: 1da7668691cbe5ff2dc9dd1933f9dabb7c80f9c458940e12c7bcc61ea607cf80
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as educational resources, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

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://bologen.ru/123?utm_term=sophomore+in+high+school+classes PDF link annotation
    • https://jafelabuz.weebly.com/uploads/1/3/1/3/131398525/f944e16fd0a472d.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/ciidoQD/one_deck_dungeon_skill_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/Ugdghib/85932965484.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/iIMhdgd/23135422427.pdfIn PDF document text
    • https://cdn.sqhk.co/vepefilome/gcZiegj/cooking_mama_online_unblocked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/rgije8e/ponusuwefezibino.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/idagigi/free_movie_download_via_bittorrent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_5fe822aa9e2be.pdfIn PDF document text
    • http://coloradocustomelectric.com/manual_psicoterapia_cognitivabvhtj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topasirerawo.rf.gd/grade_12_chemistry_textbook_ncert.pdfIn PDF document text
    • http://dumizalu.epizy.com/sda_sabbath_school_teacher_s_guide.pdfIn PDF document text
    • http://vulemeke.rf.gd/avast_premier_crackeado.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5448 bytes
SHA-256: 5533d436a754d39c0d28d42d4d19e358630d56bbf08ee525eaea6ce669683fc1
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 10356 bytes
SHA-256: 1826a7667db3ace7ffcd629cd3c54ab98d45c1d864f1e4a1ae2efd75c61e0b4d

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