Malicious PDF — malware analysis report

Static analysis result for SHA-256 a941b54f7adcf95a…

MALICIOUS

PDF

83.7 KB Created: 2020-12-26 01:35:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 32e6d0613a35adbee6aa4e603d4893e6 SHA-1: 9c186660c2398bd6c32f0614cea341325358937a SHA-256: a941b54f7adcf95ad144147c7369ea0729ed075ace13bb192a03c856bb6d14eb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://trafffe.ru/aws?utm_term=concave+mirror+image+formation+animation PDF link annotation
    • https://nazasakodaz.weebly.com/uploads/1/3/4/6/134667833/kakus.pdfIn PDF document text
    • https://xesapexoxes.weebly.com/uploads/1/3/4/6/134633169/caa37d00025c1d.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/02c3051df75341f.pdfIn PDF document text
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/viguj_zivewiz.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/sinomavasezulu_pevigosipuzu.pdfIn PDF document text
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/a1e09a3e.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/5997418.pdfIn PDF document text
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/707392.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/d7788dd3-b79b-4ce5-8f3d-e0d7277da986/lixuzufifi.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/ignou_assignment_cover_page_design.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/higher_lower_game_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b128b9bc-350d-4ca7-ac2d-bf627c6ac013/93275327355.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/manual_solutions_for_thermodynamics_chapter_4.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 4956 bytes
SHA-256: de9c6e03331e915a2aeaa92ae052633368a79b36de27e13edf41641ea5bd97f2
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 2252 bytes
SHA-256: 75249b01f804fd879b308261c0e9f07913d39b0d10908492f388a9680e7094b6
font_02_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 5504 bytes
SHA-256: a22f333a5dc45ed4529939baa5e4a0ac0543c7c3149fd771349617605ffddfa9
font_03_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 10028 bytes
SHA-256: c34e2f25be22b054987ba21159072b2fe60184c33962628f0eea418a883c9e7e
font_04_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 16116 bytes
SHA-256: 84d7890362d76aeb096308bd44adec1ac612b3e8c39d2f3c958ea7e935021735

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