Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee3158c2c01201b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 19:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6684380b2f4f9e6c523d3dc4b73ac78 SHA-1: 4ef34fa7f3c9ffd146368cbe1bc012734a362008 SHA-256: 3ee3158c2c01201b35a1ad7bb03b34abaa084026f1c25a910195df144fabe6dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these URLs are likely part of a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=easy+volume+booster PDF link annotation
    • https://gemicilojistik.com/userfiles/upload/file/50725753389.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/vegipudomike.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/sanivisexumotixijifab.pdfIn PDF document text
    • https://csn-alliance.com/data/files/64329538113.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luzav.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/gozumezavu.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/zoforota.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m9b0p1t71i66dah77suc7s82po/49672583544.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/tejafaketakujijalibafuf.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/52179963809.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092518172310215.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/53862541360.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/34400090219.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/xadaforegaguvuvorofawome.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/52086221441.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32861171233.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/44248644850.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vizor.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/29011782788.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zegisapikaluj.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/sasesawitedogivolika.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/95091463543.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/n7birbb6d1l6m50bvbl9hptoi5/bupipaj.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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 10476 bytes
SHA-256: 8e043af2052b2455d0fa48c02b6f134811fe1774254acf706fcd57252f1692df
font_02_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 14464 bytes
SHA-256: 74031971b37c4b8bc259955b71269554e1889e7ca036576ca07f57af1c979d15