Malicious PDF — malware analysis report

Static analysis result for SHA-256 4428a77c45d1bf01…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 10:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2dffba696505fc97a30c7bc9c719243a SHA-1: 883edea11b2bc563ae247bbec992b3ac2b76e9df SHA-256: 4428a77c45d1bf014e9e323615014d1596e14d578834c45fa84a7e0a499c49ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to distribute traffic across many low-reputation sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aktifbant.com/resimler/files/96828542915.pdf In PDF document text
    • http://rc-modeller.se/images/file///46707396811.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///gozijoluvakubezuguboweg.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/90556654386.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/munufazapinetakojoxenel.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/56949254159.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/lemusejujamujegonedizus.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/94695575769.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/28747324047.pdfIn PDF document text
    • https://wasael.com/userfiles/file/tosavinutika.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c53ee7f22---tapim.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/64111635418.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/napuvapijudomepative.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/41786930460.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/wogux.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/2477212356.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/garufumato.pdfIn PDF document text
    • http://healthywithhart.com/res/file/nijatedakuzavusuzalexuru.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e14965e2168d8f6bff83420030c14cfb/33578514159.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sabituvezixanukinubep.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tutaro.pdfIn PDF document text
    • http://newshop.jp/archive/file/58666192312.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/48671677415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cool+things+in+minecraftPDF 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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 17712 bytes
SHA-256: 962e1e34f301193f726cc89395beec3ad89035c71027f2fa45e4fa5bcd9890df
font_02_sfnt_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 10812 bytes
SHA-256: d274dbd7875d2a21a8a9cea49f7f83d86d7e5a44a08e695cecdffeee5e5b49ad

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