Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f526723c4ba491e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 08:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6be4157c12cb3ef3e0bc6b85fb8915e SHA-1: e20e5fa3253253c4a847b924cf57ea844d31a171 SHA-256: 6f526723c4ba491ec882209bf1664a137bcac76a9d6528959777652388d19903
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, and is identified as a link farm. The primary attack vector is likely spearphishing attachment, leading users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://eatatrudy.com/uploads/files/98334091905.pdf In PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/99998018321.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/66902095973.pdfIn PDF document text
    • http://ave-france.com/pics/files/fijeniwasunejad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cdbd6d16b---zoxalupu.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/8740353701.pdfIn PDF document text
    • http://gardatrans.com/content/Files/letuxidewopija.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tefevutu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/7145040910.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/fopude.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/96605426967.pdfIn PDF document text
    • http://net-marketing.hu/images/files/fapuxu.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/zuzosibaxami.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/sofuguniwasupog.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/43610386467.pdfIn PDF document text
    • https://oasis-travel.ro/files/savenigidapevi.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/vilijapalaxomub.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7a47e92c5833da72d42ed0ffa6e0f9f6/waburo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/senewosujave.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zawubifadam.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/92852811353.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/segimexobawan.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/vumimaxolopufebakuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+do+screen+recording+on+androidPDF 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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 17900 bytes
SHA-256: e2015553db0a477fdd40db6cee34493ab884795115999bf22ec67f6574c2e397
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10692 bytes
SHA-256: 78dde7780476bc8c266c472ac0a07836827b12e38998bcda52d89546bd1167d4