Malicious PDF — malware analysis report

Static analysis result for SHA-256 693057308e4b72b7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-14 06:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 601ba5d3fad2d58a409bdbdb53db752d SHA-1: b99d5359b3a952d3716f20144d9f630bbcc81d27 SHA-256: 693057308e4b72b75408a32e920634018dd520d6aff25f4bb311b65000eb0c46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to other PDF files, indicating a link farm likely used for SEO poisoning or phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and disposable hosting. No scripts were extracted, but the nature of the embedded URLs suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.niziointerior.pl/upload/file/64446234760.pdf In PDF document text
    • http://dvif.fr/userfiles/file/94594547339.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/sofuselisigepofakimazodus.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/jemepax.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/23263117202.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/49867875385.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210908181138.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137984c450bc---retakikavukixoto.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/boxebexipiki.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/76816998252.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/3531085225.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/40611909729.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c84d6c196a---51979094801.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/32571060203.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/76665887257.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/retosolizevidefubaborenov.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/nonakasolebize.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/dabogavugukijixiruzonoti.pdfIn PDF document text
    • https://zzwgjx.com/d/files/veralovene.pdfIn PDF document text
    • http://airzo.net/userData/board/file/jixofuwebejuwesa.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/pikefupekiwibolisaguxiron.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/webekab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=drifting+simulator+unblockedPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 11152 bytes
SHA-256: 949c4ffe0520013a336f6fe8299054dda607cdae2457143fdbd559043e84dcca
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 17396 bytes
SHA-256: b0f96e2832dea8d5e9b0b233b09795261a0471b6d6423369dbf7a95cff028bd4
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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