Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e07e73473cf8c7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 10:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 965d9862b9c1a0b2fa079644e4c63fd9 SHA-1: 6fac1cd0d629634aec9f7748955cd8e22f5dd438 SHA-256: 83e07e73473cf8c718568ed25a4bf74e76ca1def069b4596c678147266def13d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://abwlondonblvd.com/uploads/files/wobufaruxuvezuwukaveni.pdf In PDF document text
    • http://swhos.com/upload/files/pefav.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/rotasakiga.pdfIn PDF document text
    • https://ubranni.com/uploader/files/gifomefotesubes.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/nosed.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/vinenorafuwajefi.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/87552014289.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161320be2c57e2---79086005573.pdfIn PDF document text
    • https://cakkue.com/contents/files/giloxomifipaxedidiz.pdfIn PDF document text
    • http://potlista.com/file/files/ruroxuxabuvewasowifu.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/37631286365.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/60360419172.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/wubusodiwubu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/9168442981.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210913151926.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/bodigarategurukubosimaxa.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/fezafuloduzabemujemevedi.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/36221962044.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/tapete.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e4e94633---10931049663.pdfIn PDF document text
    • http://archbot.pl/files/file/gefuruzojesudawut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=online+convert+hex+to+decimalPDF 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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 18288 bytes
SHA-256: 8330c8af657d94900ced0d92ecb34b49e3a7fd0546e94df72c1862bd2081d2c9
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10660 bytes
SHA-256: 7d6a95e3421881684d776ec5c3d76328e258f3eed3de22347edb22f7c7cf3a82

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