Malicious PDF — malware analysis report

Static analysis result for SHA-256 8762d69fd0365d00…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 13:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 690885217889de61383b396ccbeec83e SHA-1: 79fa4c4916a816d009c28fda625f0c015864137b SHA-256: 8762d69fd0365d00c26e5e6fdbc6b77f9dba9b4c308946b4a59205b2c0bd542c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to host many PDFs on disposable domains, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://engineersclasses4competition.com/files/others/dosudomuzadutizeko.pdf In PDF document text
    • http://purepassion.pl/userfiles/file/bazezixi.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pibolutesekewiloj.pdfIn PDF document text
    • http://simoncaulkin.com/images/74713089494.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/91553934735.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/baxego.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/libib.pdfIn PDF document text
    • https://aokman-drive.com/d/files/dulosokozaruwuziraka.pdfIn PDF document text
    • http://chapelguild.com/images/usr/12662224782.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/14999794417.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/90303758736.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/xekudopitubikunujotutipi.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/jibejukumuxometevo.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/rifenuj.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea350f037c---vokivadozujot.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/tenawabidejer.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/68078930667.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130e065e9410---tuvon.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/bolaxuvonixalapobupe.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/47639155530.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/kabisabedaxukozumeji.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109031212258655.pdfIn PDF document text
    • https://coil.hk/upload/files/50541230736.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/redapivopagebevaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=red+rising+epub+downloadPDF 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_off0000b10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10A 10840 bytes
SHA-256: bde9f888431c50e3b9e832d61ebaa4f94fd4ef30119c5a963d387ac76e886d31
font_01_sfnt_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 15320 bytes
SHA-256: 65a8d99ce4f576b4f99c7f61ac36e72b6a105c59720d010c673cbf2daa8c14af
font_02_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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