Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef10762278473d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 12:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c54b365e2e696ae3a5ecd733c24cffa SHA-1: 3fa634b5dc1a7bb2635106ee7852b0824260afe8 SHA-256: ddef10762278473d9688de27f64aa4af1c3a0198b598d755a1261a761b24e06a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, likely used to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/68492113682.pdf In PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/19734989740.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pabevasisazaribo.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///21672202943.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/lelefesixapesefipobutab.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/linabufomek.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/34167441904.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/16901219126.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rojopazekisabebapumej.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/19888034649.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/16597197928.pdfIn PDF document text
    • http://medrea.ru/upload/files/38003674341.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/bilonumakadinir.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/89402410876.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434c5ea8ce0---dapupirorowupanetilawuro.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/13532311608.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/lanuzaxavut.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbfcb4cba7---wutijaxubuvegizawufa.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/puxigukopadelu.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/vuvejorazegus.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/83983881706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wwe+mayhem+download+androidPDF 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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 10440 bytes
SHA-256: 73ea335df6ddfab31729360161103ac0ae0311a62083e2122821d0e9dd4aaac6
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 18344 bytes
SHA-256: a81904e91819358c9fdb1be8dc81472dde037fe84f45bb8d5de2bac544837437

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