Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7395d1aa1a9022c…

MALICIOUS

PDF

72.9 KB Created: 2021-03-04 01:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9239731ab9bf5edb41a922c606246419 SHA-1: d642ecc11d1b5d6e9876ad99c5cdea400686433f SHA-256: f7395d1aa1a9022cd00aa55d944c03e937f0cf7ac9bf698a29b04838f4c3413e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate content or search results, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=what+is+the+difference+between+apple+mouse+1+and+2
    • http://xosubowavenu.mypressonline.com/what_does_queen_mab_do_to_the_manes_of_horses_at_night.pdf
    • https://cdn.sqhk.co/nanijamu/dkB1jbt/children_s_words_beginning_with_e.pdf
    • https://cdn.sqhk.co/kowetitemaro/dNThgC1/insane_bird_houses.pdf
    • https://cdn.sqhk.co/xekutenupi/icibthg/the_hangover_costume_with_baby.pdf
    • http://kurixuj.sportsontheweb.net/59833729531.pdf
    • https://cdn.sqhk.co/vameduvide/r15idCw/10780962692.pdf
    • https://cdn.sqhk.co/sazalevimit/22MGhaC/bmc_lumber_package.pdf
    • https://cdn.sqhk.co/disumuneriva/gdjiijv/cake_cutting_comb.pdf
    • http://maddot.space/online_project_management_certification_uky6lkg.pdf
    • http://tovelksa.website/netgear_wnr3500lv2_dd-wrt2y9u3.pdf
    • https://nijexenedol.weebly.com/uploads/1/3/0/9/130969845/nagibetepazasudulij.pdf
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/4508249.pdf
    • https://cdn.sqhk.co/zowonefaso/Nibhbha/capture_the_flag_online_free.pdf
    • http://jinevul.mygamesonline.org/32725507737.pdf
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/7441100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gonima/how_do_i_program_my_charter_spectrum_remote_to_my_tv.pdf
    • https://s3.amazonaws.com/bejexe/vusaxozexufopa.pdf
    • http://petojijoxura.onlinewebshop.net/53223332975.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_off0000de99.bin
45548974016e9bfc2a04f8855f21adb6154e902991b2e4e7ec38b8a2a747c84c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 5824 bytes
font_01_sfnt_off0000f25d.bin
13e10cd62114a62e58724e8c0e087b940c400d6f864779934c872bd9b71c84e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 10388 bytes