Malicious PDF — malware analysis report

Static analysis result for SHA-256 decd697d3d13c8fb…

MALICIOUS

PDF

69.0 KB Created: 2021-03-08 10:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 55146799232f58b4fa842a7231a06880 SHA-1: 1541b3f377c98b906577a4e4364ed17499fe6848 SHA-256: decd697d3d13c8fbc86efc5d506432d077c0ca4cbbb9d76fc9dc819eefdf66ab
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to technical information, directing users to potentially malicious URLs.

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://baarspo.ru/123?utm_term=how+do+you+take+apart+a+maytag+bravos+xl+washer PDF link annotation
    • http://makeyourself.xyz/fusagusifobonugado8v0s5.pdfIn PDF document text
    • http://titanof-filtr.ru/best_heavy_duty_singer_4423_sewing_machinevqfi3.pdfIn PDF document text
    • http://wgathering.org/97979141538kw2og.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/a_single_shard_chapter_12_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/gjjHgie/banana_runts_only.pdfIn PDF document text
    • http://xipukob.22web.org/xfinity_error_code_rdk-3033.pdfIn PDF document text
    • http://servisvds.ru/download_the_last_airbender_2_full_movieqz4j5.pdfIn PDF document text
    • http://hurleyshamburgers.com/71491485038i74j2.pdfIn PDF document text
    • http://hookup754.fun/rupif1ap06.pdfIn PDF document text
    • http://boomua.site/sulupubej27cn4.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/hfhdxjh/78984802352.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/bypass_frp_apk_rootjunkydkb73.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/how_to_change_time_on_reizen_talking_watchwno41.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/if0ggjg/child_care_assistance_program_ky.pdfIn PDF document text
    • http://ig-objectionform.com/zenetevipapajeta83gnn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixisenusadat.rf.gd/instagram_apk_december_2018.pdfIn PDF document text
    • http://famekuputoda.myartsonline.com/47204986042.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/manapiwefujozefuvesal.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/tone_it_up_recipes_protein_powder.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/wuroxogitisafexikosalov.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/mugokaw.pdfIn PDF document text
    • http://jugixumob.rf.gd/17553253233.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/delta_carry_on_size_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/blur_images_background_apk.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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 5860 bytes
SHA-256: 85dca718f94ff5f85fe3e51019d416a14c9b8242a68eb60b8b31919d08892de6
font_01_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 9696 bytes
SHA-256: ba1d8355f45bf553bbb5bb4659a03a699fd79000c1ffcdf01a76b6b6e0069600

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