Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27af9c0227e5d5…

MALICIOUS

PDF

77.1 KB Created: 2021-03-29 01:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71f9b21fd9a6782321861a46b0f2f674 SHA-1: 372a08c8db85d2a996b838bab18ae1349bc46c10 SHA-256: da27af9c0227e5d554b2e38ae4944922c37abeb486d62cdf6f54d821ba43e61c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://crophysi.ru/strik?utm_term=chick+fil+a+franchise+application+process PDF link annotation
    • https://cdn.sqhk.co/vozevadijut/umpzijh/calendar_calculator_legal.pdfIn PDF document text
    • http://onlyforyou.space/call_of_cthulhu_6th_edition_character_sheet_fillable23isr.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/3607eded8.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/gfsgjKG/wood_wallpaper_iphone_7.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/asterix_and_obelix_s_birthday.pdfIn PDF document text
    • http://heleogose.online/duvipojymle.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/iage3ij/cruise_critic_roll_call_holland_america_volendam.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/rawig.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/punching_shear_calculation_spreadsheet665s1.pdfIn PDF document text
    • http://newberginvestmentproperty.com/ejercicios_funciones_del_lenguaje_2_eso_resueltosnj6bh.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/hj1jdvo/xukovefoputame.pdfIn PDF document text
    • http://prequester.online/zombie_vs_fruit_plants_2vnx0w.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/bif6vOg/nepetukivu.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/fivebo/intro_text_after_effects_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/megegifoxanew.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/61630901351.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/why_did_my_netgear_router_stopped_working.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/beethoven_s_5th_easy_piano_sheet_music.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/how_much_are_the_infinity_gauntlet_comics_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/26050412.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/nutricion_parenteral_formas_de_administracion.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/paul_vigil_classic_fantastic.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_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 5072 bytes
SHA-256: c9917c45bba2bf007d90896086b8946ac2fcb45812367102d04b7b91014aa084
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 10636 bytes
SHA-256: 1540ea5e749e2ec6716d283e2d9d0b92ed1ff80749bbbb03703a71b308b13c04

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