Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbd79ef49bd8717…

MALICIOUS

PDF

74.4 KB Created: 2021-03-15 02:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 4833c57b97e7828d7a977834ae6cebf4 SHA-1: 3d4ad3d9f8671530f77280f85ee1b9081f7af39f SHA-256: 4dbd79ef49bd871747eeebea6b6e67169cdcbd370d0f600df13ea34c89a4edb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to search terms, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vilenefex.ru/wix?keyword=what+is+an+undefined+slope+in+fraction+form PDF link annotation
    • https://cdn.sqhk.co/vedasukuki/haifZsa/street_race_cars_for_sale_on_craigslist.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/jgjhgeY/tube_tops_plus_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_603f54da19db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6038378d85007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497109/normal_5fdce27bf286c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_602be3e9b9eeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_600482340b017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_603b85978c822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fec2f127da2c.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/4iaCgfr/youtube_video_ideas_to_get_subscribers.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/vifoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/hfKpie2/zombie_farms_promo_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_6048e0e0e11e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_603e5d4a6327a.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/suzodewapogojuz.pdfIn PDF document text
    • https://cdn.sqhk.co/risevejuxik/RFGcna4/viganotupawot.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/jOQiab4/8202962356.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/igh5Fif/dark_souls_remastered_guide_wiki.pdfIn PDF document text
    • http://medolufinumul.sportsontheweb.net/50623647597.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/gfgdKhb/homeschool_curriculum_reviews_georgia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegenig.epizy.com/uv_fly_sheet_for_horses.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/43374344374.pdfIn PDF document text
    • http://bajipogijos.epizy.com/fafebibuleziterav.pdfIn PDF document text
    • http://jexaziled.rf.gd/janubiputepufikokofekada.pdfIn PDF document text
    • http://zasuzutan.rf.gd/aperture_shutter_speed_iso_tutorial.pdfIn PDF document text
    • http://forilojemani.epizy.com/pakobuzeru.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/ciclo_de_krebs_pasos.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5408 bytes
SHA-256: 7234a62d1bb21aa032271c7b4fdbeef1b6642a1d2576dfe364bbac0d5ffc3f82
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 10948 bytes
SHA-256: e290f991c60fecba6ea27c96feafc14353a0a6b2c33afd69d6edbbca50e95e46

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