Malicious PDF — malware analysis report

Static analysis result for SHA-256 99107f989c9dbef7…

MALICIOUS

PDF

65.5 KB Created: 2021-09-26 23:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae00ae8c9f4c40ed4a6ce2f84053470f SHA-1: 2c70fc21f601672fec9d652b62a3bc79e9fbdcf0 SHA-256: 99107f989c9dbef76a8c329b21ad853ea0b79493aaa4d5c758b0968f7ff38fd4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded action trigger, typical of screenshot lures. It contains numerous links to external domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 65 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://anhhieu.vn/hinhanh/file/wevuziwuzuxikozatekajifa.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317907a3de2---matexumudaxabomijo.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/22799774613.pdfIn PDF document text
    • http://4rrecycle.com/files/file/bexuzuzipedixeges.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/pubezofowalaxefubu.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/16482075542.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zebogisik.pdfIn PDF document text
    • http://innotack.com/userfiles/files/mominatipimolenupumibipij.pdfIn PDF document text
    • https://www.znackakvality.info/files/gapivese.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161390ed6c945a---54037612674.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/bosubuvitutakosuzarudum.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/93927047510.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/tunowip.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/lilexovoj.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/81284002103.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/17912613907.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/fatezaledugake.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/xojal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+close+ads+in+phonePDF 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_off0000a714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA714 10588 bytes
SHA-256: c149e93d2fdad15132daa2c163b88b86ea748cbd448b126fc68df79fc1b46f7f
font_01_sfnt_off0000bf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 14084 bytes
SHA-256: 4c8a33e86779e15f73318dde94ae34b85b0c1104f8784dc80e32afca866e1a2b
font_02_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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