Malicious PDF — malware analysis report

Static analysis result for SHA-256 267ead9cd6fa8468…

MALICIOUS

PDF

76.1 KB Created: 2021-06-06 07:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 027633560df6f871392a6badf3a0c9f2 SHA-1: 50faa295f3d8f8fdb38ad398c14573921c9a4c44 SHA-256: 267ead9cd6fa8468012c01f5adf6cd7e9fe01b02af741b7b0d1ef83f206fc519
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm designed to redirect users to various external PDF files, likely as part of a search engine optimization (SEO) scheme to distribute malicious content. The primary malicious URL identified is https://crewmak.ru/pbw?utm_term=yasin+suresi+oku+pdf, which serves as an entry point to this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • 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://crewmak.ru/pbw?utm_term=yasin+suresi+oku+pdf
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/e0aa1521.pdf
    • https://dogixosewe.weebly.com/uploads/1/3/4/6/134633635/zevedofonepe.pdf
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/3792860f97.pdf
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/8578120.pdf
    • https://kigazapaxulet.weebly.com/uploads/1/3/0/7/130774964/5039418.pdf
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/2828287.pdf
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/1982680.pdf
    • https://xijivokabororix.weebly.com/uploads/1/3/4/8/134879859/rokalap_tuwuf_mububenuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nagomax.pbworks.com/f/does_illinois_allow_religious_exemption_for_vaccines.pdf
    • http://negovijalulu.pbworks.com/w/file/fetch/144412455/zurudexuvekivojodimone.pdf
    • https://uploads.strikinglycdn.com/files/46ee098b-62d5-40ee-b096-905b792e65b3/92414276719.pdf
    • https://uploads.strikinglycdn.com/files/9b52b039-ab6e-4eb8-9692-d6ce343bdee2/2019_ram_1500_crew_cab_long_bed_length.pdf
    • http://vatojorisa.pbworks.com/w/file/fetch/144612204/academia_de_vampiros_6_google_drive.pdf
    • http://tufukamapaf.pbworks.com/w/file/fetch/144511470/que_esperar_cuando_estas_esperando_pelicula_completa_audio_latino.pdf
    • http://likanegi.pbworks.com/w/file/fetch/144513552/kaxifitunonemu.pdf
    • https://uploads.strikinglycdn.com/files/842cf299-6340-4e4d-b9d4-730ed6fd9197/52787247823.pdf
    • http://zuwofig.pbworks.com/f/kabujokutigojezabi.pdf
    • http://keborekudud.pbworks.com/w/file/fetch/144686565/lefuko.pdf
    • 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_off0000eaf5.bin
1163cc60c8e480784e86942054822117cb8c0eada4597d6206e151e56648caa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 5028 bytes
font_01_sfnt_off0000fc1f.bin
ded961561f2456453248ac4cc081f87593f906bf54e969cf9d1243a5cc2bb540		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 12388 bytes

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