Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c5f7b848d77d6…

MALICIOUS

PDF

78.6 KB Created: 2021-03-25 08:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9170185b2edbe30c6b1b384d1968ee9 SHA-1: b61b26303cc100d598fb023403d58205b5f7ab20 SHA-256: c58c5f7b848d77d6fa2399ea88099fafc098c03871ae3227cc342632ff0269ce
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URLs and the link farm heuristic suggest the document is designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains keywords related to 'apk mod' and 'wkhtmltopdf', suggesting a lure for potentially unwanted software or malware.

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://leonvi.ru/wix?keyword=bomb+squad+apk+mod
    • http://rinusiwujegabu.medianewsonline.com/levuve.pdf
    • http://miwuzobi.sportsontheweb.net/related_studies_about_cosmetics.pdf
    • https://cdn.sqhk.co/fezavomol/pq99jew/swing_low_sweet_chariot.pdf
    • http://lupelisizi.medianewsonline.com/gate_engineering_mathematics_syllabus.pdf
    • https://cdn.sqhk.co/fotajoge/ygphgji/pioneer_sph-_da120_update_2020.pdf
    • http://tonedomopoja.scienceontheweb.net/gajaxiboduja.pdf
    • http://sutovuresas.mygamesonline.org/words_that_start_with_n_to_describe_someone_nice.pdf
    • http://pofaduxiruk.getenjoyment.net/samsung_un55ju6700f_wall_mount.pdf
    • http://jeweboz.iblogger.org/woxebezotarudaju.pdf
    • http://bitalotava.scienceontheweb.net/can_you_have_multiple_spouses_at_the_same_time.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tedijafubivot.epizy.com/wutobuxobatani.pdf
    • https://s3.amazonaws.com/sajatofubote/blocks_game_for_pc.pdf
    • https://s3.amazonaws.com/vatosolikijike/ley_4_2017.pdf
    • http://wipibefab.onlinewebshop.net/mathematical_terms.pdf
    • https://s3.amazonaws.com/salosibejodod/39956027940.pdf
    • http://liraperuwuw.atwebpages.com/plane_ticket_template.pdf
    • https://s3.amazonaws.com/befarekogol/maschine_mikro_mk2_vs_mk3_pads.pdf
    • http://zejibanunepi.myartsonline.com/acta_constitutiva_de_una_sociedad_anonima_ejemplo.pdf
    • http://zesafemumibow.myartsonline.com/tisaropogex.pdf
    • http://fazovalekotevo.onlinewebshop.net/50596148019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaad.bin
166a638a12c2c5e6c628fc3318fcb2f2e005a42759e67a496e8e46dfee0c7cb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 4884 bytes
font_01_sfnt_off0000fb37.bin
bf7242c972a6411e92f76c59141872c650db62bc717e7061fe8a50f6906b9966
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 10536 bytes
font_02_sfnt_off00011f2a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 4324 bytes