Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c534aff9b1a29…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51d07e753aba7994677d6f55ede16c35 SHA-1: bb798219bb35aed3779a1b357c366effeb40970f SHA-256: 091c534aff9b1a29981657c9c61d05889d2c8926a6c597957a5c56441ab6db4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable hosting, and one specific URL is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://oncallanatomist.com/ckfinder/userfiles/files/54916541103.pdf In PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vijadudexaxugopepig.pdfIn PDF document text
    • http://word.mn/uploads/assets/15702677589.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/zupadoxef.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/73695684037.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/7306819532.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090309384945.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918639b191---sajusomatimituwazefoke.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/tefod.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/fabaraw.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/13840387529.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulobij.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/91839621597.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/fosulamuvopu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eeb6dae0427766e995e8841bf54834a1/tigiga.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/64746018735.pdfIn PDF document text
    • https://stvorki.ru/files/file/zenakeserijusoxemer.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/68244581066.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/gapezivoz.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/jejefujakanoxarawi.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/digep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=social+networking+portal+developmentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 11008 bytes
SHA-256: 49b60f5b0b81b477c39e5bf17f19644e2a4189908b466b52166f014338194e1b
font_01_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 17164 bytes
SHA-256: a6cdefc0af2a5a5ab712d61a7c57e983dca19859cf5b413fe05a59166c29c09a
font_02_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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