Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d0d4b9f68c85bc…

MALICIOUS

PDF

67.7 KB Created: 2021-03-24 00:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aa5a957653b6246f2c59f3fa9f55be4a SHA-1: 341b628a90a0106265e4464682021fb940aae51c SHA-256: e9d0d4b9f68c85bcfa8b04137407879d0ca5cc5dd2a9fedeb0774b90845413a0
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary focus on 'vilenefex.ru', suggesting it's designed to redirect users to potentially harmful content. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely using a social issues lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://vilenefex.ru/award?keyword=definition+of+social+issues+pdf PDF link annotation
    • https://cdn.sqhk.co/piwuzuberaze/14hjBfb/xasirixinozunaxirawuron.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/cGGd3je/gexat.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/basic_cost_accounting_mcqs.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/ngdfhjW/zugebasabuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/JA2hcFT/lironemibulazatupatimad.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/87763397682.pdfIn PDF document text
    • http://moitender.org/types_of_adjectiveslo3in.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/8644931596.pdfIn PDF document text
    • http://podifodosej.scienceontheweb.net/atomic_habits_audiobook_free_online.pdfIn PDF document text
    • http://filfex.ru/base_rate_neglect_definedbgc1r.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/jfNgihh/940265841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d894310-0846-4881-bf5d-93e3a10c2ef7/52312984018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f67952c-0fd1-4579-8c18-0a1b99ea5837/vitamix_strawberry_banana_ice_cream_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/lejokulofubakonadome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029341e6-23a2-45f0-9192-8ea99952eebe/how_to_remove_pimples_marks_from_face_in_one_day_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47640f3-7225-4d2a-93e7-29595233674e/hp_laserjet_4200_roller_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/41981216152.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/98318008955.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/caterpillar_butterfly_life_cycle_worksheets.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 5052 bytes
SHA-256: 30e07f20f7a6ba7910cc419e5d49de7df21fac976581c562505cc89a88f41ddc
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10008 bytes
SHA-256: 879447ed92dfceec31aa6e151c7fb0c4b506f93c7881327f2cc250b011dbff8a

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