Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee292c53b0dfb78…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 11:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45160734525ae7e51fe2df9c06e1b77f SHA-1: 67679ddfcad9f321efa39739147f7a1d6d104442 SHA-256: 3ee292c53b0dfb78e8747a86b4bae37e8946ff89e9bde8e6d821b21b263a030c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable or suspicious domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://ketchas.ru/uplcv?utm_term=freedom+fighters+android PDF link annotation
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/91167393449.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/66283782311.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/86756322505.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/fofigifeke.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/regiregusetexataro.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/gipikomasanazoxiwe.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/palikozok.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/69682371185.pdfIn PDF document text
    • http://henca.com/files/details/file/74503925034.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/tuxisizimomepej.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/xujisoxanetugonoro.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/sosejekenene.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/nekubowoxupag.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/4279754083.pdfIn PDF document text
    • http://voijin.com/userfiles/files/52641342936.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/72605684230.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/depukudan.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b7751531026f79c624ff28d89f77e163/mubebofepagomed.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/jovilojigelak.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/nipisedojudus.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/54733973281.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/wubaj.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/zeniru.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/53446814990.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce55970623---patav.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/15105730390.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/40523658438.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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10732 bytes
SHA-256: 9cdb4f1353375d37304966fb48fe469b6c0bdfd14d6f7572bd5dc49429e9f0da
font_01_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 16908 bytes
SHA-256: a0d67583560fe9d6ecec164112de5d0fd6def44f71dfd8e07030a1f1b7852c95
font_02_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1