Malicious PDF — malware analysis report

Static analysis result for SHA-256 d612fc3c3e4ee7a3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 06:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3e6bae121b9c5f30b15b90658100b58 SHA-1: 05958c1cd2fb0ab18970fc32d5c330f768dfefa6 SHA-256: d612fc3c3e4ee7a3a70b63a67102febdb2efb110450611e39133f876d65804be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of 'utm_term_redirector=True' in one of the heuristic firings further supports the idea of tracking or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=substratum+apk+download PDF link annotation
    • http://phantasos.org/userfiles/file/mevogifone.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/suwavura.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/60753299232.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/70184111475.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4d9e3313fdcc516a74d9729e6ea8c03/20559570216.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/wagarifojuzuga.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/zulepaponufomeporeruz.pdfIn PDF document text
    • http://meta-min.com/files/87736291798.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/24970756258.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/68382807417.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/juxoxeburomufor.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-20/20210920035444677953.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/82661215192.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/1453721784.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/34706478693.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/nexipexazodenobod.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/72148311512.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0db30175---gojedewidagaweroviwilipil.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/jujijuxisi.pdfIn PDF document text
    • http://osayit.com/images/file/jajusukenowotudokovuz.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/zonul.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/xalokub.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/74004340096.pdfIn PDF document text
    • http://inica.org/files/file///2510119046.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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10820 bytes
SHA-256: 9890e5426023048f4eff585df7ca3ad0954bfc32393725a7c038ea8fe4d3d71c
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 18336 bytes
SHA-256: 973d9490aa69610a67c38596efffddb8344a815486868741dbd545f9ebb1e683

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