Malicious PDF — malware analysis report

Static analysis result for SHA-256 a947ab826f2882a9…

MALICIOUS

PDF

74.3 KB Created: 2021-01-30 12:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 565f417db3ed344c1c2dc5fb887d8d66 SHA-1: ff2d7414fa7ab6f07e10f4f7f37f5bb584bd24ef SHA-256: a947ab826f2882a90c238899c651f9b5b7e644d9d9c8e48c8e47281793d69b46
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains or link farms, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to worksheets, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=continuous+compound+interest+worksheet+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/linerutinew/K6hekEL/ty_draw_road_cardiff_postcode.pdfIn PDF document text
    • http://teenagetutor.net/77503639168zuci0.pdfIn PDF document text
    • http://pokemonrivals.online/judajuwazoxefufuraravivoz1as7d.pdfIn PDF document text
    • http://detonicro.website/annoying_orange_splatter_up_online_game350ym.pdfIn PDF document text
    • https://cdn.sqhk.co/kamugututu/dJjaZbI/74110981747.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/21892411504.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/i3hjjga/last_of_us_2_wallpaper_for_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/Xjbihje/ampere_meter_analog_10a.pdfIn PDF document text
    • http://fazojum.66ghz.com/mobicontrol_device_agent.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/Sjaijha/zombie_avengers_stickman_mod_apk_unlimited_gems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/xerimelol.pdfIn PDF document text
    • http://timavutiziv.epizy.com/game_avatar_musik_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/79992739192.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/konikusivogigolupiweme.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/rosegawidimixevokupa.pdfIn PDF document text
    • http://getozareburi.rf.gd/58038617588.pdfIn PDF document text
    • http://lapamapifutul.epizy.com/bingo_live_pc.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 5424 bytes
SHA-256: 506415982ebf623f16d5d2dee8d8ac8253a58d9cba9ccaa971d57a2d732d1ebf
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10244 bytes
SHA-256: a47d06d1acc93cf4f4a4aa95fab50900cd5cc4326bfe592fb5db6c1fce1fdec0

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