Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae77521d942164c4…

MALICIOUS

PDF

80.7 KB Created: 2021-02-16 09:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1facd4e7cf5592a92f96998bdb074913 SHA-1: e51a7168a09e5648d0b379d6582a6df75583d2af SHA-256: ae77521d942164c40efcec89d44dc3f69fc7a3517acee616613e10446a8c6d9f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious or unknown domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=youtube+little+house+on+the+prairie+season+1+episode+2 PDF link annotation
    • https://cdn.sqhk.co/nawinirezuj/aiijahb/wonudoxebabeja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_5ffb817e23b14.pdfIn PDF document text
    • http://leyloften.online/acr122u_sdk5o131.pdfIn PDF document text
    • http://zarabotok.space/97351856103aqb75.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/nGgehh0/azaria_chamberlain_bones.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/Gfg6Lgd/tewipebafape.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/S38jdIU/kanefigiwox.pdfIn PDF document text
    • http://mosoxiliraf.iblogger.org/distributed_control_system_interview_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumofif.rf.gd/budgeting_worksheets_printable_monthly.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/bumuna.pdfIn PDF document text
    • http://lanuvurunipa.epizy.com/86610151378.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/sofevazalizeravogidi.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/correlative_conjunctions_worksheet_for_grade_5.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
    • 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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 5332 bytes
SHA-256: 7e90111db4a5748257a05b86bbafc2a1c85942a016083304b02d949617ba1d4e
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 10320 bytes
SHA-256: aa04badfe541105ad4c49872735cc7d1190128198220d9e1d46dc41dae07692a
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 17484 bytes
SHA-256: ff80b801dafac7c72ec8756d643d63f0f4546c249a5eaacdb0e944e79493a781

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