Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5d9f8df3f7b923…

MALICIOUS

PDF

75.4 KB Created: 2021-03-14 03:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 609fcfe0bc41395a308cbc722ac8091a SHA-1: 7bf4eef31492b1c4d727c898511f11534f281354 SHA-256: 2b5d9f8df3f7b92359e14da75461b9e02dfe1331d7d11055c879f210fc661ef6
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 embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to network security, likely a 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://nipisod.ru/123?utm_term=information+network+and+computer+security+m.+s
    • http://deruvakibifazo.iblogger.org/voluxobobupamizevutoruwe.pdf
    • http://imkl-checker.com/chronological_life_application_study_bible_nlt_reading_planqfz0s.pdf
    • http://bubobimurasawe.iblogger.org/simple_english_wikipedia_word_list.pdf
    • http://pop-marketplace.ru/zalidipowot6mqh.pdf
    • http://pobasomitiji.22web.org/78835914535.pdf
    • http://vipadobotisituz.mygamesonline.org/batuan_beku_asam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xewepipesu.epizy.com/ear_acupuncture_book.pdf
    • http://lupumik.rf.gd/51977711082.pdf
    • http://wafowexo.epizy.com/87187275250.pdf
    • http://gijezilisabe.epizy.com/fikokazaxirebosovominagal.pdf
    • http://kebafitesulodu.epizy.com/21449786302.pdf
    • http://wiwawilif.epizy.com/25308639454.pdf
    • http://nisetekotixob.myartsonline.com/are_ketogenic_diets_bad_for_you.pdf
    • http://dokufexazag.epizy.com/data_studio_funnel_template.pdf
    • http://sokexodine.rf.gd/sitegetijeviv.pdf
    • http://vamazoligosuni.rf.gd/figetekuxatoju.pdf
    • http://vafikozokus.rf.gd/1995_polaris_425_magnum_specs.pdf
    • http://lipubumili.epizy.com/95725067230.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_off0000e85e.bin
769ebbd7168ed8b5b26822736b361303a0300add370248090850f4b08f110a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 5496 bytes
font_01_sfnt_off0000fb16.bin
4174fa488eceeac19ecba1db91741c84df4587025ec5bd2f1b1eaf4102b7f3f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10824 bytes

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