Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa5b4e9c2d899b1…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 10:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3a463dc120410a99543e1e1ed9e7134 SHA-1: 46bbbe2cdbb67bd25c123f3a3a1c4cd4c3fe5237 SHA-256: aaa5b4e9c2d899b1d04f0911fa29c67ccc25d1ea94b14a825e536b279cf65434
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of a disposable link farm heuristic further supports this, indicating the PDF is part of a larger infrastructure to distribute malicious content or manipulate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://benly-carson.com/product/files/35725512499.pdf In PDF document text
    • http://stonestudio.pl/files/upload/file/26110593920.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/25713122491.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/1712282301.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zarosuminajolabaxob.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/sifugaxobonezutagoxiveka.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/17529353079.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/27546530695.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/makugigopo.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/8571937397.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/42541026686.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/97190601082.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/61292594246.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30363603185.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/19499580925.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nasolotegobiwovapik.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/26250235479.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/pamiweg.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/wiveluwuteturodubezili.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb3f3f6c8---41088094921.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/35192060404.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/1444690857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quotes+to+melt+her+heartPDF 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_off0000ac3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3F 15312 bytes
SHA-256: eeaa702e9e0167852518d56fc0d20fb353f5ffea1a4bb7001b4bdcdc5cd05a63
font_01_sfnt_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 10336 bytes
SHA-256: 0b2f98ac448c1f8e1ca54ccec9e47fab8b1f2471ee7a73dcd5c4dbf2ce23cd01
font_02_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1