Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd2470bf7fedf53…

MALICIOUS

PDF

82.8 KB Created: 2021-03-31 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51dac0490d924887bfa735273771e2f6 SHA-1: df1ee8fde79e89d639302604c7e864c64d130fca SHA-256: bfd2470bf7fedf53c45a6edbc752b23fc9e302ac8feeb30141df0b1809039bb3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to present a printer error message to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=hp+officejet+pro+6835+problem+with+printhead+0xc19a0023
    • http://creditscorefix.info/animal_crossing_piano_sheet_music_easy1o2jr.pdf
    • http://moymagazin.xyz/zwangerschapsduur_berekenen_formuledqzhr.pdf
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/tawobupizedadu_xoriwenesagamar_vixot.pdf
    • http://flowerport.shop/existing_conditions_report_constructionc92i1.pdf
    • https://dexewagumaz.weebly.com/uploads/1/3/1/4/131438443/lebeveziledibid.pdf
    • https://laforefuje.weebly.com/uploads/1/3/5/3/135333455/zejimovixepadilivuke.pdf
    • http://guzofegarakad.iblogger.org/32890645252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sowewazulejewi/xetixunozabodidinujumatew.pdf
    • https://uploads.strikinglycdn.com/files/0262124d-d60e-482c-9211-4d762a82748c/83643788311.pdf
    • https://uploads.strikinglycdn.com/files/559459fa-b637-4333-9016-8eb82c11a86d/what_platform_does_uber_use.pdf
    • https://uploads.strikinglycdn.com/files/cd314e98-3677-4381-b87b-d36b0e181d5f/bhagavad_gita_chapter_16_meaning_in_sanskrit.pdf
    • https://s3.amazonaws.com/wulotugadag/sasural_genda_phool_full_song_pagalworld.pdf
    • http://didewuwu.epizy.com/98975169817.pdf
    • http://sojisij.epizy.com/numorijijofavamoganovi.pdf
    • https://uploads.strikinglycdn.com/files/4761747b-95c1-45c9-86db-ff1a717dddc6/us_army_white_paper_format.pdf
    • https://s3.amazonaws.com/sajatesawodiji/back_at_one_piano.pdf
    • https://uploads.strikinglycdn.com/files/f5617490-67cd-44a5-ab87-262278e4e5ed/angle_sum_theorem_worksheet.pdf
    • https://s3.amazonaws.com/bupesejirijejus/62785307998.pdf
    • http://nofugodevi.rf.gd/juwilu.pdf
    • https://s3.amazonaws.com/patotale/what_the_bible_says_about_comfort_zones.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_off0001011a.bin
92d859b5e1d25ee02878f6e9d22d07412da52ba428e95025c55ab6462af99626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 6672 bytes
font_01_sfnt_off000117b8.bin
17476ddc5957abe829a9a0e3b4248fbf282133c3c73bb7a4de126af061e9a6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 11072 bytes

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