Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa65c47e3506e3ab…

MALICIOUS

PDF

67.5 KB Created: 2021-02-20 14:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 736fdf68a1cd69227211a4054c0bd83d SHA-1: d4f5b753de3106040a82c09ff72c629dd98e121c SHA-256: aa65c47e3506e3abff49aff8c25ec12b2c10a3cb9996d5e5ccb554c2e850b73f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm for SEO purposes, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=boatswain+mate+tattoo+on+hand PDF link annotation
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/tegatagafigog-laniguze-totanokofu-lazipebinulimig.pdfIn PDF document text
    • http://lejugowiwusog.22web.org/carbon_emission_and_climate_change.pdfIn PDF document text
    • http://mishgen.com/xuwumurogiwodipozowor2mc3.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/jdohcgh/tunudazewamuruwujaxajok.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/ibJiige/gagunolumanedovolab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxejufoli.epizy.com/97980992293.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/50375077378.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/87680336493.pdfIn PDF document text
    • http://reronagut.epizy.com/nejubogid.pdfIn PDF document text
    • http://nopilire.rf.gd/waxufinanirajik.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/nejova.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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 5080 bytes
SHA-256: b2c5321457024cd3e3adbec8e2cdd1b51c5652e5cde0ba481745160bf93fa165
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 10300 bytes
SHA-256: ba9651b872b92ca464df0121c4e5989a8fc3fba0a2f0102601c64e55786f364b

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