Malicious PDF — malware analysis report

Static analysis result for SHA-256 849403a84738e757…

MALICIOUS

PDF

69.8 KB Created: 2021-03-20 22:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05689aa9c802cb92252f4499e0381749 SHA-1: 1cdbd3a7ba246037cffa3abe313145f57785503c SHA-256: 849403a84738e757f62b4baaa63ace383f57c02daf33c4d01e8c335ff7459b60
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 trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords like 'Caresource ga provider forms' which could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=caresource+ga+provider+forms PDF link annotation
    • https://cdn.sqhk.co/xaripisi/jjc3gfy/18353318606.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ibLDig2/vebulevefak.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/haYjcib/mobanajegitilasotasipera.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/bemuruferemuro.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hR2yXzL/jitiwerovinerukopib.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/frigidaire_stackable_washer_and_dryer_not_heating.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/defukazuzixixoki.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/kewitizajudefejo.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/cqjhTja/gepojivawinapesaxerol.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/mecanica_automobilistica.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/list_of_emotional_words_in_hindi.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/dewalt_dw402_parts_breakdown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopovis.myartsonline.com/langston_hughes_education_quotes.pdfIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/37988065236.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/cevdet_bey_ve_oullar_yandex.pdfIn PDF document text
    • http://litorow.myartsonline.com/vikud.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/tusojubo.pdfIn PDF document text
    • http://duwamiwimi.rf.gd/goblin_ost_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/wowazilewi.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/robin_hood_2010_trailer_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/tipos_de_archivos_de_audio_ventajas.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/chopin_prelude_24_difficulty.pdfIn PDF document text
    • http://sekuwomexapa.myartsonline.com/sanyo_32_inch_tv_remote_code.pdfIn PDF document text
    • http://xiletubijalu.rf.gd/how_to_assemble_dirt_devil_endura_max.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_off0000d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 5408 bytes
SHA-256: b4cdd1295da1c652276492204b42032babc081296443815805441c7a637490b6
font_01_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 11028 bytes
SHA-256: bb27abe030d8c0f7bda1c06c148ab5ff2b7519cee9b567451ab93ee79f49e5e0

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