Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bf80e2298c5394…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 20:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb0c803bfb71eaba7a7d2f999c4b6674 SHA-1: 8c94efcf6f99a621e01a79bcf464be2966f9d0f3 SHA-256: 82bf80e2298c5394813f89b2d48415e4f4beca901334a060952a55e754eb3bef
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. The presence of a link farm with numerous PDFs hosted on various domains suggests an attempt to manipulate search engine results or distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://togclick.com/media/userFckfiles/file/korukug.pdf In PDF document text
    • http://thietbiantoanttk.com/uploads/files/fodijevef.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/27969528811.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vefij.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/12524264218.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/xalujaforejumewuka.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c507922a9---kadujibirigurunogawovegi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/tekubukupibewosuwon.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/101612007875.pdfIn PDF document text
    • http://feg.vn/uploads/files/feripefuxupoxeza.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902111655.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/bisiv.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wowivisamorelevalidub.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jokevixeno.pdfIn PDF document text
    • http://cabini.it/userfiles/files/vaxemowowilavoxed.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/remidivizi.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/gikasa.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/23056187576.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/jijusutatava.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210918_CC75E9574277ED36.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/toxinajosevuzevotenifuri.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/wupesag.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/modafodugivu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/vusulanuburazibapapam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=biology+of+plants+8th+edition+pdf+freePDF 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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 11152 bytes
SHA-256: 3729ff7e4f95da042e190a6bf1496f5276d9a74cbb010e59c4c6ad04b7f9d85a
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 17060 bytes
SHA-256: c5c2732d169ad4fcc4e2a9fe84edb31e015a98fe02f48de34491c96abeb8068a
font_02_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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