Malicious PDF — malware analysis report

Static analysis result for SHA-256 1872f5eea6bb2d4f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-30 05:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0979922ffc6a4622fd003539439bfd23 SHA-1: 3ac4d99f45ce65a5fa6287ce71a11bd23c82a24a SHA-256: 1872f5eea6bb2d4f09e5bbba1332e21026ab85468f76c13410e60f18f5395b44
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://lozipotod.ru/123?utm_term=attu+movie+video+songs++isaimini
    • http://topdouche.xyz/bibbulmun_track_guided_walksoq7gx.pdf
    • https://xajekedifa.weebly.com/uploads/1/3/4/4/134469171/9449005.pdf
    • http://nuraramibifowom.22web.org/baidu_browser_free_2019.pdf
    • https://sexozubo.weebly.com/uploads/1/3/0/7/130740033/fce33ab4.pdf
    • https://cdn.sqhk.co/vuzefoveniri/LwjcMWH/72360237923.pdf
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/jafakevalojow_teviles.pdf
    • http://interstart.online/16942674617iyp8m.pdf
    • http://technodom11.com/turn_your_problems_into_opportunitiesrvg16.pdf
    • https://cdn.sqhk.co/dosiloxof/Okgg7ja/23176035408.pdf
    • http://naxuvazexipok.sportsontheweb.net/19404964013.pdf
    • http://razetinebi.22web.org/c_h_s_full_form.pdf
    • https://cdn.sqhk.co/refimadaraze/whfUBhb/vegan_diet_food_list.pdf
    • http://lighttravel-ng.com/26908953919ieerf.pdf
    • http://lodomujimujug.mywebcommunity.org/letorimumubuvinivutalo.pdf
    • https://cdn.sqhk.co/wupofolizaj/MR02egi/drive_parents_car_insurance.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pawuzax.onlinewebshop.net/2507821789.pdf
    • http://zewukiro.epizy.com/4121784975.pdf
    • http://woxesizefibugel.atwebpages.com/assentamentos_informais.pdf
    • http://pepojugatidi.epizy.com/7_little_words_bonus_answers_july_29.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_off0000de83.bin
d0718151e05528b04269a5151e6ca70dd04ab849e36e713fac5ab91be87748f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 5068 bytes
font_01_sfnt_off0000efb8.bin
14f75b104b2b23268dfb4691d3cde28f9948c552c396fd9a14b60647892b30ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10948 bytes

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