Malicious PDF — malware analysis report

Static analysis result for SHA-256 13236472696c1132…

MALICIOUS

PDF

66.8 KB Created: 2021-03-24 09:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be556c3d1ed5018245f7a1b047227cc9 SHA-1: 433fba6181ed2d66b9cca29cdc860143450d6cdf SHA-256: 13236472696c113201274e3d5ea77128d796600444fde9ced64ac7ed2ac79289
124 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('crophysi.ru') that is likely used to host malicious content or redirect to phishing pages. The PDF structure and embedded links suggest it is part of a link farm designed to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8647

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/award?keyword=series+voltage+regulator+using+transistor+pdf
    • https://munuvatatopa.weebly.com/uploads/1/3/4/6/134686277/rujix.pdf
    • http://vijexibat.mywebcommunity.org/67699293525.pdf
    • https://cdn-cms.f-static.net/uploads/4482219/normal_603b1a0dc08ef.pdf
    • http://zipubezexupoka.mywebcommunity.org/how_to_make_a_beanie_hat_crochet_for_beginners.pdf
    • http://lemakomude.sportsontheweb.net/sevinasupazo.pdf
    • https://fakedowekiz.weebly.com/uploads/1/3/5/3/135314463/37472.pdf
    • http://depusapo.mypressonline.com/vapavosixikituzenevijijix.pdf
    • http://zabovawupe.mypressonline.com/lakufubibepamupenaralumum.pdf
    • https://cdn-cms.f-static.net/uploads/4424933/normal_601a1b6df1744.pdf
    • http://sumigemag.mywebcommunity.org/64166423747.pdf
    • https://cdn-cms.f-static.net/uploads/4406793/normal_603d44e75595e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_f363cb20aac74d15bdae83e1f5f1621c.pdf?index=true
    • http://woxesizefibugel.atwebpages.com/definicion_de_auditoria_financiera.pdf
    • https://s3.amazonaws.com/mivokozibu/how_much_is_my_tempus_fugit_grandfather_clock_worth.pdf
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_2de9c25732e84a16a78ab4aa043839a7.pdf?index=true
    • http://gumomexad.onlinewebshop.net/how_many_carbs_in_sonic_sausage_breakfast_burrito.pdf
    • https://s3.amazonaws.com/gajabedafot/47366967310.pdf
    • https://s3.amazonaws.com/leteraxewe/cicatrices_regulo_caro.pdf
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_a6e4dd1149a44cd784eacbe5b51ad410.pdf?index=true
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_68deaa9dbe01468191689c7d248827f8.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d434.bin
cd5a26abd6a2602aab294be8a3d20fe85b967aef42c3914a4b1eebaca5ee7b05
pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 5256 bytes
font_01_sfnt_off0000e624.bin
137d5f6171a949d2502bbedfdd2da294e516edf3f1dd0492de7bf18a7cc499c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 10648 bytes