Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e29c76658478f0a…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 08:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dfd6e133f18f31f283221d89d1c011c SHA-1: b9e9ad18b8af77b746467c275d82bc9d921e5824 SHA-256: 8e29c76658478f0ab1fa6d67e59bbc2c3bb28c2f744354ebdc3d8b9bdf9064e9
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 or trojan. It contains multiple external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, further supporting a malicious intent to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what+to+do+when+your+kindle+won%2527t+turn+on
    • http://jovopomutulilo.medianewsonline.com/mini_dv_tapes_walgreens.pdf
    • http://gopubewigofopa.iblogger.org/prentice_hall_gold_algebra_1_2-5_answers.pdf
    • http://jubigorut.iblogger.org/87775733243.pdf
    • http://lowazaz.22web.org/how_to_report_inter-_item_correlation.pdf
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/4349334.pdf
    • http://muwazowezijowa.22web.org/badland_2_hack_mod_apk.pdf
    • http://daxepekudinis.iblogger.org/95449099277.pdf
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/9415288.pdf
    • http://wojesukuzak.mygamesonline.org/fopeju.pdf
    • http://gojavodevagajuw.mygamesonline.org/cetoacidosis_diabetica_pediatria_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kituvofaxur.epizy.com/84761893205.pdf
    • https://s3.amazonaws.com/tutapaxi/bully_math_3_answers_android.pdf
    • http://vimixof.onlinewebshop.net/el_juego_del_ngel_de_carlos_ruiz_zafn.pdf
    • https://s3.amazonaws.com/sikuva/aprendizagem_motora_richard_a._magill.pdf
    • https://s3.amazonaws.com/roxawo/buwaxapaguvojoge.pdf
    • http://dopugidov.rf.gd/19616952589.pdf
    • http://pexabeni.rf.gd/survival_knife_kit_reviews.pdf
    • http://segipiked.epizy.com/canadian_writers_reference_7th_edition_coil_bound.pdf
    • http://tikimiwuwal.myartsonline.com/lotifetavadineduvonidali.pdf
    • http://kobebosafuraw.rf.gd/miragugizasiwuz.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_off0000e606.bin
222f7aa6546957db46323e42946003fedf9ab8e1f3379989ab91feb0837a63d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 5040 bytes
font_01_sfnt_off0000f747.bin
432b856b4745c1d1e2ed04b22df945a4de12c851f5b63255e73276738051ac5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 10544 bytes