Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7319b3bee269801…

MALICIOUS

PDF

71.2 KB Created: 2021-09-22 17:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96be695bf5834f5ee6014163367e5182 SHA-1: 608cdff05d2b91a5d84abc9b335556640d91ebb9 SHA-256: a7319b3bee2698012efa5da53eeb68aeb7c2cfde2d4943181cc37ac5e18a1ab6
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 phishing or a trojan. It contains numerous embedded URLs pointing to various PDF files, indicating a link farm or distribution mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gpszone.hu/upload/userfiles/file/vuzifikoguser.pdf In PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/52358782723.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/67499095505.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613efada08e22---12827762050.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/wuwulazafiwonamu.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/87636414119.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/77078015815.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/zimofi.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/21728627118.pdfIn PDF document text
    • http://www.bash.cl/media/file/kalojosigemadapo.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/49784414767.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/lunipivanoput.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/bawixapajodivabipeditimo.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/10391332433.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/68858012135.pdfIn PDF document text
    • http://airfa.it/userfiles/file/24813111466.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/79907167632.pdfIn PDF document text
    • http://timebymtm.com/upload/files/42380594627.pdfIn PDF document text
    • https://manenshop.com/upload/files/43261809519.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/9636477146.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/40580700988.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/67609986311.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/1736926557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lemonade+tycoon+android+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_off0000b48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 16620 bytes
SHA-256: 277d58691239278d8c4604d96f11417c0cdbbc44770866cf78eecff594ef8d61
font_02_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 10624 bytes
SHA-256: 6afeb009fd721da0b9991dde5f7ca4c3eeaa80f06e628f63ec694e7d61608daf

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