Malicious PDF — malware analysis report

Static analysis result for SHA-256 22acc1e9a18aa80b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-08 17:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba601fc4e54f8a801e136fc4e88eea4e SHA-1: 4fddf274b568e8ef3049ac32d67a28f57cc35abf SHA-256: 22acc1e9a18aa80bc62ada64bf65d16f0ba6ec1b3b0c8adf71fa54e96eb56155
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a strategy of using disposable hosting for a large number of links. No scripts were extracted, but the overall structure points to a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://finadev-groupe.com/userfiles/file/6977244793.pdf In PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/8158325308.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0fab0459101fc0667e41105fc98d7e32/xixifanagibopupirigo.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/39476078723.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/60656659240.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/64784382663.pdfIn PDF document text
    • http://pinxedien.net/upload/files/sefosakosamixom.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/73426325656.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/32606910670.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/92731062609.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/67577283788.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/49065787053.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613206f17524a---xowoful.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/36811793060.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/55405776621.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/tirini.pdfIn PDF document text
    • http://vce34.ru/attachments/file/lurapasedaporojuxel.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/91677712056.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/91117450401.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zolozubo.pdfIn PDF document text
    • http://stylekd.ru/files/67892488702.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/11366219978.pdfIn PDF document text
    • http://idcla.net/upload/files/18536618292.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/salolamomiwelinofox.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/jupomabat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ajcc+cancer+staging+manual+8th+edition+free+download+pdfPDF 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_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 11572 bytes
SHA-256: 8ddb4ff253b2ab638b6c2e85a3dfb236427f0fe83acafcc62aa1af8950507cb9
font_01_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 14976 bytes
SHA-256: e1bc766650bb7a06bc6c9bf92fc7ccdb933e6c5b6daa8fc2adab5216548f5664