Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe26c161a710659…

MALICIOUS

PDF

81.0 KB Created: 2021-03-20 00:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 602fd5cd736cc25e5f19591d019e3e7f SHA-1: b068000840bac61362b654ea77eefc52bcf22ee1 SHA-256: 2fe26c161a71065960fc369aac1c9cd2fb7cc265d7e19213177771257efb9d59
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate the download or delivery of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=albores+definicion+informatica
    • https://static.s123-cdn-static.com/uploads/4482215/normal_6001e1c80102c.pdf
    • http://getdouche.xyz/are_vent_free_logs_safec9rg9.pdf
    • http://yarrebitteh.online/passive_and_causative_exercises_1_bachillerato54f1b.pdf
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5fcb5570d580c.pdf
    • http://medazuxa.mywebcommunity.org/wawozisulorifuxuzu.pdf
    • http://kazexajisodibu.medianewsonline.com/mudoj.pdf
    • http://vavexefane.mypressonline.com/muslim_mutton_biryani_recipe_in_tamil.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_601d7801ef93d.pdf
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5ffbdc0dbc9a8.pdf
    • http://mosuzovopij.22web.org/consistency_standard_of_reporting.pdf
    • https://cdn-cms.f-static.net/uploads/4481522/normal_60465bd4800f8.pdf
    • https://cdn-cms.f-static.net/uploads/4489980/normal_604e0d3aad69d.pdf
    • http://foyou.store/par_excellence_synonyms_in_englishzjky8.pdf
    • https://cdn-cms.f-static.net/uploads/4427820/normal_601f0308464b9.pdf
    • http://nenamusun.iblogger.org/64314620014.pdf
    • http://philonio.online/jarenalunx1z6b.pdf
    • http://pollsexpert.com/nexaletozesen1tsb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7bc2ec90-c9ad-4907-ab01-5745ba53525a/is_black_an_unlucky_color_in_china.pdf
    • http://midotujeg.rf.gd/nueva_reforma_educativa_2016.pdf
    • https://uploads.strikinglycdn.com/files/4776772e-386e-479b-bf4d-f90037e6f71e/how_does_nestle_creating_shared_value.pdf
    • http://topatux.rf.gd/latutinozuruwazobewalib.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_off0000f95c.bin
e3403f88f6967aa9eb4ced740c58a194a8125ff6a1335216dd47393d4b77f022		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 5296 bytes
font_01_sfnt_off00010b43.bin
17bfac83e627c82017835a65e54e80892f789aef9bfb249987de953c34aabc46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 13068 bytes

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