Malicious PDF — malware analysis report

Static analysis result for SHA-256 d894b440e20267b3…

MALICIOUS

PDF

100.1 KB Created: 2021-04-28 00:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f70213d5a67aac531b1460f092f7ac12 SHA-1: dd8000e04df50d08c2b241932c202d88089e2e33 SHA-256: d894b440e20267b332f3bac5b86a728e9c7702b048812ee0d32eb3a849dc5f02
186 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 pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://baarspo.ru/strik?utm_term=journal+of+international+students+scimago PDF link annotation
    • https://cdn.sqhk.co/terodekijur/jbumj0e/nedibivirugolepew.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/CZjj8ai/alliance_x_empire_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451045/normal_5fc7e02e39de0.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/esquema_corporal_segun_autores.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_5fd8ebe932daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_602633c6287c9.pdfIn PDF document text
    • http://tututot.mygamesonline.org/45471771250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_6045152e89ad8.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/vjgticx/ups_center_goldsboro_nc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501380/normal_6058e040ed175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_603045a8ac510.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/jdiWjg6/kolivewo.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/writing_equations_and_inequalities_from_word_problems_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_6058b317c6db3.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/cqNSrjs/gijudixivufep.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/fibpdTG/57502497828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_13654ca959164c18a6ce0b7f29999515.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_f4d83db8dddc4296ba1f4743ff75a05e.pdf?index=trueIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_9195ce36a4ec43598f0a4ee8301df9c8.pdf?index=trueIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_97ce87752ac84adfaf43c8b7ee63c3b0.pdf?index=trueIn PDF document text
    • http://mogixos.atwebpages.com/12th_maths_mathematical_logic.pdfIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_286d85e6f24d439499c1ea635c56d90a.pdf?index=trueIn 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_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 4580 bytes
SHA-256: 7aeede1649d11904f0902e8141cf6ba27ff07ca0cefaf904c89001fdcbbfc63b
font_01_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 5212 bytes
SHA-256: 45e1645804a75581b1067875b480d21108ef259eb5fb29d8f52796ac1055383c
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 11560 bytes
SHA-256: 0b406d559a8d8ad3403571bbd85c668359167c9b57f15f60d6604325384bc6c6
font_03_sfnt_off00015e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7B 16252 bytes
SHA-256: 6b61ce08d5cbcd732c1ba5b9b20d77eadfb28368fbdc9418a8567b0e29b143b2
font_04_sfnt_off000173ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173EC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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