Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b94ab2045d7e45…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 23:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1821a4ba23a8e1a197607e091c2ffc6b SHA-1: 186854c68a814ec78cd4541f7105a58321c27f01 SHA-256: 86b94ab2045d7e455fb2c2371b81f1621171139aabca718a53bbe9b5624eca5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious attempt to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=super+mario+64+rom+hack+star+road PDF link annotation
    • http://louisamerino.com/userfiles/file/27324234433.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210911_8199E981CF66B671.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bimofowozepe.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/43297446658.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/zinekovege.pdfIn PDF document text
    • https://menu2uplus.com/images/file/patevetetipudafudimojeno.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/87708089048.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/19731014626.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/bixavu.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/pilezixuweneboda.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/61835938376.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fulodevavebewek.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/22681269578.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/sekiguzufesofozipaveg.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/limefovoxomipiburow.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rh561dhmglk71fphnan5jl8u7g/25827136116.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/jutumololi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/64359393571.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/vamiwepoxedipanuxexutim.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/fewaweke.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1b926fb8122cdb2b5c93f13394a119bf/3285706584.pdfIn PDF document text
    • http://myslizdrave.com/soubory/5534527489.pdfIn PDF document text
    • https://taperagi.com/contents/files/bexodon.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/xugizawivewodutapugekugom.pdfIn PDF document text
    • 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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 11140 bytes
SHA-256: f4c6d6c44efa5e7e75e5414ee4054cf446241488fe9d3e80830041e46ca675d3
font_01_sfnt_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 15884 bytes
SHA-256: 562fdb00b271d55fd5ed176d5623c1ecd7f0eb9ff7dcd14f2d9baf4007817c15