Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cddf151693e999…

MALICIOUS

PDF

79.1 KB Created: 2021-04-08 22:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333e9fe4e423a102f1e7d81443295dcb SHA-1: 8af4d155e40442bfd5b26b9bcdb71e22dbc0173f SHA-256: e6cddf151693e999e8bc629cce85684c4e0785bc199bba0dfd22504da4ed5917
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a prominent one leading to 'fokemale.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the PDF is part of a link farm hosted on disposable domains, designed to redirect users to potentially harmful content.

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://fokemale.ru/strik?utm_term=all+physics+equations+explained
    • https://cdn-cms.f-static.net/uploads/4445114/normal_6037543632ed0.pdf
    • http://mx50off.pro/nelson_grade_11_biology_textbookdg52k.pdf
    • http://trastenmyqort.online/22358142235a39m6.pdf
    • http://aycotoro5.xyz/domupizusefevetonapevodafrpga4.pdf
    • http://niluwipewuxasa.medianewsonline.com/masa_kejayaan_dinasti_abbasiyah.pdf
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/3837666.pdf
    • http://lalolexezo.iblogger.org/30809574947.pdf
    • http://boevoenlp.com/20552518057wq9bi.pdf
    • https://cdn-cms.f-static.net/uploads/4383572/normal_602864334ee03.pdf
    • http://mosuxuvemuzuwex.mywebcommunity.org/corel_cdr_to.pdf
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/d766f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://raxegujanamefas.atwebpages.com/malaria_parasite_atlas.pdf
    • http://sanagubilisefuw.rf.gd/ragat.pdf
    • http://vibesegajepo.epizy.com/82929254346.pdf
    • http://mawokale.myartsonline.com/cathode_ray_oscilloscope_experiment.pdf
    • http://bisiziwaros.epizy.com/rivexaremodulegutejonavoj.pdf
    • http://nabulegewuwal.myartsonline.com/arithmetic_and_reasoning_books_in_telugu_download.pdf
    • http://zozituvumob.rf.gd/what_is_the_story_the_lady_or_the_tiger_about.pdf
    • http://xulelaperimiku.epizy.com/kivuzonusobitagumugo.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_off0000f98e.bin
3aa918aa6ed4618eca7ca48072a4b0974b6143d749a84da37b3ef1ee2fd0b929		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 5352 bytes
font_01_sfnt_off00010bcc.bin
27b944d552c5e0b92668def0f1652b0ed193a29bf34c20fa42345a9fa8330be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10460 bytes

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