Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e36c8debfffa3c0…

MALICIOUS

PDF

70.5 KB Created: 2021-01-31 01:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 838848bd9c46cc45a05ad4ec9c1866a4 SHA-1: 70dba853dc0921f06af4aea72f719766f8c3d225 SHA-256: 2e36c8debfffa3c0dd5a562de94dfb992249a826729176536e977dcb849fea41
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links, many on disposable domains, pointing to external URLs. One such URL, 'https://crophysi.ru/123?utm_term=pink+computer+case+uk', is embedded and likely leads to a phishing or malware distribution site. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://crophysi.ru/123?utm_term=pink+computer+case+uk
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5fd80a2f17a60.pdf
    • http://pinudub.iblogger.org/child_anger_management_printable_worksheets.pdf
    • http://thecaffeinatedstudent.com/4981823640430wm0.pdf
    • http://subefimajifulik.22web.org/car_title_bill_of_sale_form_texas.pdf
    • http://ewwe.space/legends_never_die_sheet_music2mrw6.pdf
    • http://allostar.buzz/fisica_y_quimica_1_bachillerato_sant9s3h1.pdf
    • https://cdn-cms.f-static.net/uploads/4491686/normal_6015e91f78376.pdf
    • http://flowerport.market/950029943435e9aw.pdf
    • http://beach-fruit.fun/jovilatudenurobrfe0.pdf
    • http://lnstagramservicecopyrights.com/64744391972dse2.pdf
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/babasumoguw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://detotoga.epizy.com/android_developer_language.pdf
    • http://miduzusajaveg.rf.gd/always_smile_wallpaper.pdf
    • http://limixumijegaf.epizy.com/24847619670.pdf
    • http://luturuwuxas.epizy.com/5537_photoresistor_datasheet.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b3.bin
91edf13d88e5c441722aa11f48a881ea465832aa496a7b932fd34b9fb4e495a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 4996 bytes
font_01_sfnt_off0000d68a.bin
67f7a27e7ef4fdaa1b87d547d9b3fb5f5a86018e5d1b9b51908d7285b4cff877		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 11776 bytes
font_02_sfnt_off0000fd88.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 4324 bytes

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