Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17fbecb674ea15b…

MALICIOUS

PDF

67.1 KB Created: 2021-05-08 18:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97b9a7145fde0702639cd876d3f30369 SHA-1: 887852fb873a30a694188431aaf70de244abea7c SHA-256: b17fbecb674ea15b3057220f1880a9e60dc8fb725f47ef4ac8b32981c3bc0dc0
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8385

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://jumiwimov.ru/strik?utm_term=samsung+c24f390+24-inch+curved+led+monitor+refresh+rate
    • https://laziboxejebemu.weebly.com/uploads/1/3/0/7/130740401/dujuv.pdf
    • http://nozekem.iblogger.org/the_cask_of_amontillado_espaol.pdf
    • https://cdn.sqhk.co/rufebumu/jfhf6oG/11744494093.pdf
    • https://cdn.sqhk.co/bubuzibiv/j3RjbeC/77050036482.pdf
    • http://fimobuzenetotij.iblogger.org/bed_sore_stages.pdf
    • http://xozowilozoga.mywebcommunity.org/how_to_charge_a_polaroid_portable_karaoke_speaker.pdf
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/4185845.pdf
    • https://cdn.sqhk.co/lekifuwixal/sjbjNtN/49472228449.pdf
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/bidesotalug-tuvif-lavesizekax.pdf
    • https://cdn.sqhk.co/kufomopinu/aHjfhhE/becoming_a_substitute_teacher_in_texas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://molodoku.rf.gd/vakaxawogiberemujukipesu.pdf
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_fc5d5d9dd27e47e0ae85135fcde337fd.pdf?index=true
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_b01348253cd149639ea692d85cdf478d.pdf?index=true
    • http://vagenudutuxa.rf.gd/29922657187.pdf
    • http://zowipazivavi.epizy.com/gastrointestinal_disorders.pdf
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_8b4450cdf44b4a538de1d667f8ab9ae2.pdf?index=true
    • http://gegilifopom.myartsonline.com/fluke_intellitone_pro_200_price.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f375.bin
f8474ac20737f90504d6af1164aa4148f0e0e906e4e3f3f580bedfc6990dfc74
pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 6196 bytes