Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4987a4371f714c…

MALICIOUS

PDF

119.1 KB Created: 2021-03-31 22:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1d4380f30412cd244820b02b58a57a SHA-1: e0298e5c40b7a18e2565650340cdc1113dbc3cba SHA-256: ca4987a4371f714c003d87fbbd7b511170216c9da9fa4d5128b8625bd449622b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=deductive+and+inductive+logic+pdf
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/liturukenefanudu.pdf
    • http://yandex-delivery.cc/52695355787r81tz.pdf
    • http://bluebadge-support.com/sajijobejufotoxasoboso0tf0o.pdf
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/f43b170a8.pdf
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/zusulosujosarez-nirodebigigitu.pdf
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/41b6f25a0eeed.pdf
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/vudom-jopevomemuxako-sakapet.pdf
    • http://ramuwesitavoz.mywebcommunity.org/pdf_binder_filehippo.pdf
    • http://kixiwogazu.sportsontheweb.net/diet_cleansing_drinks_to_lose_weight.pdf
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/18ab61.pdf
    • https://zubenori.weebly.com/uploads/1/3/5/3/135394140/2ac5c1be938b.pdf
    • http://dobuwiwitevotir.sportsontheweb.net/administrative_management.pdf
    • https://wogefusupe.weebly.com/uploads/1/3/0/7/130740138/kapefofovuremej.pdf
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/f1efd0b478.pdf
    • http://totalcreditreport.info/dovuxowofugodika17h92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xakajoziwibi/93755556322.pdf
    • https://s3.amazonaws.com/pujirageg/pesupadu.pdf
    • https://s3.amazonaws.com/mesixadelomomo/jadunodefiruma.pdf
    • https://s3.amazonaws.com/fajixe/jefiwegirep.pdf
    • https://s3.amazonaws.com/vovuzize/19810308727.pdf
    • http://lazuletezofik.onlinewebshop.net/poxopani.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186a2.bin
f98ae629af0a007b7afb73753ed95cc990a290d9b3f80bded8c54cf336cdb885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186A2 4988 bytes
font_01_sfnt_off000197bb.bin
192dc25441fe603728e435b2f3a54607e945c0c90ba8a8abb886f357ab211a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x197BB 12248 bytes
font_02_sfnt_off0001c08d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C08D 4324 bytes

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