Malicious PDF — malware analysis report

Static analysis result for SHA-256 369f8f6f43be0d6e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 08:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 863baeac5a1e3690782fe89d77c6112c SHA-1: 0f1a0088f418465433cedb11feab93e7dee00fff SHA-256: 369f8f6f43be0d6e404caed0f8b0bd6ab3947a7cef4311d19661753a5ade3295
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely leveraging embedded JavaScript or other PDF exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=happy+words+that+start+with+d PDF link annotation
    • http://leylatoprak.com/userfiles/file/21866151755.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/23703425604.pdfIn PDF document text
    • http://coumert.com/images/file/lomogamapefexajegip.pdfIn PDF document text
    • http://fohow77.ru/upload/file/53676162386.pdfIn PDF document text
    • http://gibisch.biz/files/files/nasoxedimusemine.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/10399839167.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/pomamoforiz.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/palokedoxarimij.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/65729808048.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/dedijur.pdfIn PDF document text
    • http://sial.pl/galeria/file/3982226223.pdfIn PDF document text
    • http://gysanya.com/upload/file/210912181035096396lzddnujhzlvc.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/25210702949.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/wofige.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/1421802202.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/87820407999.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jimeke.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/33146457306.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/21642777721.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210912_5975DD5B3313B541.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bobafuba.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/93375220569.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/pomabudefupavul.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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10400 bytes
SHA-256: 2fd0c930a9f8a3b3294e87cfb0923aba327476e444ca7e5b2735f0c31975469c
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 17416 bytes
SHA-256: b8ac0a0f93f7e8402081539e6edd849abc59403b6b9f75f28e435e825e77cecc

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