Malicious PDF — malware analysis report

Static analysis result for SHA-256 659117a4423db6da…

MALICIOUS

PDF

73.4 KB Created: 2021-03-22 12:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 29ccd15514149bbf874c9fa1fdebf6bc SHA-1: 2637c8d18473467c93306d3dfd8bf2d5fda396e3 SHA-256: 659117a4423db6da80b8b49ee407fb5f408b9e35c892b03eb76c00d4dded5f9c
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 numerous embedded URLs that point to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic indicating a 'link farm' strongly suggest an attempt to lure users to external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=heart+touching+love+story+south+indian+movie PDF link annotation
    • http://lnstagram-copyright-confirms.com/nadovovafebafadibejedinemr5nc1.pdfIn PDF document text
    • http://retelikilerodad.iblogger.org/fonozonibu.pdfIn PDF document text
    • http://natnat.fun/52529985973di1kw.pdfIn PDF document text
    • http://spain50off.info/gesabezemeo98a3.pdfIn PDF document text
    • http://netlysy.online/zurich_balanced_managed_ap_fund_fact_sheetr8yyg.pdfIn PDF document text
    • http://openchambre.xyz/monster_in_law_full_movie_123moviesuzhh8.pdfIn PDF document text
    • http://smartroom.pro/cfa_level_1_exam_weightstieoa.pdfIn PDF document text
    • http://dayzcommunity.info/pathophysiology_of_cellulitisykhi8.pdfIn PDF document text
    • http://omshop.space/niwopudegazerufaj208h.pdfIn PDF document text
    • http://renatoxun.iblogger.org/effective_presentation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukagodikuve.rf.gd/mevizarolojo.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/tc-helicon_voicelive_play_acoustic_vs_boss_ve-8.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/business_plan_title_page_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/hungry_dragon_mod_ios.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_ac594c6f54b54d4c8d46b61e0d51861b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megulu/circumference_of_a_circle_worksheet_grade_4.pdfIn PDF document text
    • http://pozijirume.rf.gd/apache_tomcat_web_server.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_36e2ada48bd546a981f7bee4fcd018af.pdf?index=trueIn PDF document text
    • http://tekojexabutixas.epizy.com/65927055247.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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 5476 bytes
SHA-256: ebe710efb36d72c0a6c64227db00ad3a92cbbac220346a67e373716260ac81de
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 10232 bytes
SHA-256: c6a985d694bcae44f3a09df0b065112671885e8364f88efa0aff1effa9ce6ee8

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