Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c51e67d499e957…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 09:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93c6240ec4070f651bd77cf5e2868e95 SHA-1: 7b6c42bb2612f89bbd093415cc4eb6862c37f8e2 SHA-256: 54c51e67d499e957942673da21280e77ce286b5cccdf7e46b0481b9d2f7cfb0b
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, indicating it likely exploits a vulnerability or employs social engineering. The presence of numerous external links, many pointing to disposable domains, suggests a link farm designed to redirect users to malicious content, potentially for phishing or malware distribution. No scripts were extracted, but the PDF structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pomacanthe-art.fr/imagebeforeafter/files/nanuba.pdf In PDF document text
    • http://espokebar.com/uploads/files/57596276610.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/31957842384.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/fipejom.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/fudakezesubodiravobuxe.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/55297322085.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/33051199368.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/75414608254.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/91246226197.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/dinojetakinefifikosezujam.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/visovemofano.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/fekidimidubolubo.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/43230105830.pdfIn PDF document text
    • https://sanagustin.cl/files/79374120512.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2353e086---sopapapimafiz.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901075651_2076668475.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/vuzagigifofuzapo.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/mudilapaj.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/79948091755.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/roxukakanamapo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8d2702540afd584f92c461972f5b7a51/zinezogodifevijunewipuvuk.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/84348438564.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/nozabise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+valiant+hearts+full+game+apkPDF 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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 15024 bytes
SHA-256: 83c355316a8fdc8f715cc9b923d431104610fd4bd1e140515cba9553b5fa0b9d
font_01_sfnt_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 11292 bytes
SHA-256: 733dd5c4ca029d30741f745b1f25838fb8335ab47d1ffdc4eb442411646d24c2