Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46095f490c2b3f8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 23:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b14b63267e3f286374d08c42b0dd9e34 SHA-1: 43c833920e5eb2ccffe9fbf13f2c166f1c07e8e5 SHA-256: b46095f490c2b3f8901738f6afd99d8e22b0340a5522fd6d889301ec893247d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm with numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a non-clustered link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://archism.ru/uplcv?utm_term=google+android+os+price PDF link annotation
    • http://antonio-pelella.eu/userfiles/files/5119024213.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/37316815554.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/47315778153.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/26323972448.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/95561866408.pdfIn PDF document text
    • http://archbot.pl/files/file/getodipapowibunotazona.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/58248141827.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/16243796914.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/lakubafagalozufexiruzo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/47433065143.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/nosevamepajometowegerire.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ca6ddc75---39370238092.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/91917181820.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/20440595098.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ledotasugoli.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bisugoninagirisimewoxibip.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/tavivebeperari.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8fgrf46pao15m79h9vjciku33b/87919358074.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/28746594102.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/jodopemigodebulasanozini.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/zavawirewozubetixuj.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/40397667912.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://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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 10628 bytes
SHA-256: e10785a97c85b33288b704de5b2d32c524b733a8337fa601602347923c57e0ad
font_01_sfnt_off0000d074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 18948 bytes
SHA-256: 9e10c40137f3d95e982e6726a0a075cfc4b137e49c6626c08511da1e559954d1
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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