Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf36feef0a385d7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fcdf5eb834fff8fc94f3ca705e06fcf SHA-1: a9104e2a339fc7e01278091d1c36dffc6aa08f74 SHA-256: faf36feef0a385d755345f1457890ac2a14a744492427f6b365304deec351c92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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 http://dison.cn/filespath/files/20210909065808.pdf In PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192082694744.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912203202.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e0e26199e54607576d811e595d160775/19180372863.pdfIn PDF document text
    • http://unibox.lv/files/text/31008471442.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/duwepikixamezaguwofogewe.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce51401bd---nadarodezowesojikixuwimad.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/ragexanegogabugekikafoto.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/rodifubijorifizuwidumejob.pdfIn PDF document text
    • https://redac.ch/upload/fekosixibivis.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/wubafifofuge.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/62074796445.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210910_D7EE76595A643A77.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/weraginekopepibar.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/21616430846.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/75531875568.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/57943330764.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/25089674311.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/42105911440.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/tinevupilinamikili.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/080648102369.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/38030946216.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210908015452.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/renavitagugelufesigipik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chris+brown+little+more+song+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB753 10952 bytes
SHA-256: 21d1249cbfa0d3a71def2669188f0093ecb2138f0fcfa4d36108881c429b3700
font_01_sfnt_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 16072 bytes
SHA-256: 902678d70d393ec6790f54b939a7831cbae168616780f9e4f602b8e5a65831b5
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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