Malicious PDF — malware analysis report

Static analysis result for SHA-256 87af431571cc099e…

MALICIOUS

PDF

73.5 KB Created: 2021-06-04 07:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4608022edf8fb04bf58c5634d5915ea1 SHA-1: 2fc06d917de292bf1fb4139a8eea964ac23002dc SHA-256: 87af431571cc099ebdc9d396002088444e5d4bd24ad9ea8e4829d95dc3cf047b
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5347

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
  • 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
  • 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://krisoc.ru/pbw?utm_term=cambridge+secondary+checkpoint+past+papers+2020+october+english
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/zamexekubajegaga.pdf
    • https://vosikobogoj.weebly.com/uploads/1/3/4/2/134235386/vogibifobuluvuge.pdf
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/miwusiseki.pdf
    • https://vurusewotuludi.weebly.com/uploads/1/3/0/7/130739344/tagomuwabegu.pdf
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/zoseveb.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/devuwisuronax-jisibejibizifag-jenapeziziri.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/ed9fc.pdf
    • https://dixelopenam.weebly.com/uploads/1/3/4/5/134590152/2599213.pdf
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/393588.pdf
    • https://zisowuwaxafo.weebly.com/uploads/1/3/4/7/134700917/b4856c.pdf
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/3174193.pdf
    • https://vupikesuxal.weebly.com/uploads/1/3/4/3/134397623/pujixoxog.pdf
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/mebodukukegonafot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zajozote.pbworks.com/w/file/fetch/144444297/is_raft_still_getting_updates.pdf
    • http://tusawijer.pbworks.com/w/file/fetch/144464205/charitable_trust_deed_format_in_word.pdf
    • http://zixereves.pbworks.com/w/file/fetch/144533790/32241748552.pdf
    • http://garigor.pbworks.com/f/grams_to_kg_worksheet.pdf
    • http://kigemulu.pbworks.com/f/63913992518.pdf
    • http://vakerul.pbworks.com/f/zazobopenixopugipo.pdf
    • http://sizolasipape.pbworks.com/f/direwejufi.pdf
    • http://figuduvimeti.pbworks.com/f/sokofilosogereti.pdf
    • http://pinurakus.pbworks.com/f/what_is_kirkland_jelly_belly.pdf
    • http://wejojixi.pbworks.com/f/71361374765.pdf
    • http://xalomuzavege.pbworks.com/w/file/fetch/144458994/vaximujepedunonamizigiw.pdf
    • http://kapetipubi.pbworks.com/f/hack_simcity_buildit_ios_without_jailbreak.pdf
    • http://rimogeto.pbworks.com/f/30112668588.pdf
    • http://xovelezid.pbworks.com/w/file/fetch/144415719/descargar_gta_sa_para_android_lite.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010945.bin
5164b92d6be81b1d6ef8a2f6b7da5c4433c0d4768f4333360c592fe042c2c01c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 5972 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.