Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e7ba7a3663dc34…

MALICIOUS

PDF

85.7 KB Created: 2021-06-01 00:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b59cd6962574e09e5278c4318a6302 SHA-1: c105fe5327daf86112ba8ec56639d3a2f85438d8 SHA-256: a2e7ba7a3663dc345c6ef27047d665166fd06c44dbb6b2b4be6a1166eb32845c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or a method to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=abc+calligraphy+worksheet
    • https://cdn-cms.f-static.net/uploads/4497079/normal_603fbfa22647c.pdf
    • https://static.s123-cdn-static.com/uploads/4498842/normal_6000f6d4a72ac.pdf
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/1688231.pdf
    • https://cdn-cms.f-static.net/uploads/4488569/normal_60597fc4e4b57.pdf
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/9804d7eecd.pdf
    • https://cdn-cms.f-static.net/uploads/4422912/normal_606006971a308.pdf
    • https://penabapemuzoji.weebly.com/uploads/1/3/1/4/131453208/segetejozaxoweketur.pdf
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/jevatasigenoki_kafid.pdf
    • https://tilevofatuso.weebly.com/uploads/1/3/7/5/137513428/rejisowazovijej.pdf
    • https://cdn-cms.f-static.net/uploads/4388620/normal_6027ba64b9e8d.pdf
    • https://cdn-cms.f-static.net/uploads/4417527/normal_603b9b8332a79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb465d87-3251-4ce9-9e9d-2c63ce67503d/how_to_change_a_belt_on_a_whirlpool_duet_steam_dryer.pdf
    • http://pezeliv.pbworks.com/f/fikoxixowef.pdf
    • http://xetibubib.pbworks.com/f/stoichiometry_mole-mole_problems_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/7da91549-1c9b-4157-b0ee-81518d10ad8c/free_meal_plan_for_bulking.pdf
    • http://niwomif.pbworks.com/w/file/fetch/144428112/12768779876.pdf
    • https://uploads.strikinglycdn.com/files/ccda7a99-1c3e-4db0-8dea-c0ab1efe2825/what_are_fixed_and_variable_costs_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d1.bin
8585ac8c6a48013b544d5de56a7d82aaff2008966c8feb717754556263f69ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5584 bytes
font_01_sfnt_off000103db.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 1800 bytes
font_02_sfnt_off00010c69.bin
7137ed319dee169e36099acb667d7a1c431600601ebe3007c2c345093cecc974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 11272 bytes
font_03_sfnt_off000132e3.bin
5524f903227ff292daeebc297c1f67888251e0d4f28055af68e7128295089c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132E3 16340 bytes

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