Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8cdc8878626047…

MALICIOUS

PDF

75.0 KB Created: 2021-03-21 04:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b9db94fd325e11e5bda6143ebb7ebc SHA-1: 77a144392cd7c3f553fda356ec4607a8c1c2d715 SHA-256: 4a8cdc887862604787a8dd61e543a1ae001f6550e52904b87ad58c67bae901a3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) and an ML classifier. It contains a large number of external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to contain metadata related to its creation, but the primary malicious intent is derived from the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=modo+de+produccion+feudal+definicion
    • http://sewonmedix.ru/31109192397lqqx3.pdf
    • http://tersq.space/72076684619w8l2g.pdf
    • http://nnorm-id.com/harrisons_principles_of_internal_medicine_19e_citation4b4vt.pdf
    • http://yognat.space/lixubofaxotisabisav56p0s.pdf
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/mibepabapelaluw.pdf
    • http://lnstagramsupportinfo.com/swat_force_vs_terrorists_hackedvshtv.pdf
    • http://kyukty68.xyz/rixofakaxopifunafonufunij5bg0n.pdf
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/40d4882833.pdf
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/gizugifemuk-nozeja.pdf
    • http://mitutepoka.medianewsonline.com/43600179694.pdf
    • http://prizyivnik.ru/821688858787n0pc.pdf
    • http://xufikefizot.sportsontheweb.net/basic_c_language_tutorial.pdf
    • http://juborad.mywebcommunity.org/case_files_pediatrics_5th_edition_free_download.pdf
    • http://nizavevorupuj.mywebcommunity.org/panthertown_valley_hiking_map.pdf
    • http://wisatemubudu.medianewsonline.com/weather_the_storms_of_life_quotes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_f9c06cbb0c6e455699293c6d86d372ab.pdf?index=true
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_374c9622c3894a758d7e6e95798ec1a7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f5.bin
e1cd58a56c8736d5f0f59a8b4ef063ed0c6a12c0580ea171ceb28214a39d3d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 4976 bytes
font_01_sfnt_off0000f700.bin
cc53a169072c3f822fbc55c439b7021381d220586579198324495ece891dbfed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 11692 bytes

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