Malicious PDF — malware analysis report

Static analysis result for SHA-256 81281467190f0850…

MALICIOUS

PDF

89.3 KB Created: 2021-03-26 08:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fb80c43ca2bb38665fbcc38d6079f45 SHA-1: 54433357738611ae0c281a8a22ddc6d3d401f996 SHA-256: 81281467190f0850d9368e656c49bad6f9549cee5811bce6d7843b5b9cbb8c01
186 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 0.9992

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=clicker+universal+remote+garage+door+opener PDF link annotation
    • http://favodokoleti.mypressonline.com/new_technology_in_automobile_engineering.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/e52SVOZ/onkyo_hf_player_app_android.pdfIn PDF document text
    • http://bekunogoxabune.iblogger.org/xogenuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ggDKvhi/pupewovu.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/ffXhcij/microban_24_disinfectant_spray_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/hUFvxjc/86456116227.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/m2DjhkH/movie_maker_online_video_editor_photo_song.pdfIn PDF document text
    • https://pitidupokeni.weebly.com/uploads/1/3/4/4/134485339/wixufo-fegaxanu-nitisule.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/33440527501.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/tiwiw.pdfIn PDF document text
    • http://xavanafaworinev.iblogger.org/63167298750.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/ay_sound_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/ggdDghL/gosebasamapefizuteri.pdfIn PDF document text
    • https://debamivuk.weebly.com/uploads/1/3/1/8/131871977/abbb10049ae0.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/bulolimepol/certificate_of_excellence_template_google_docs.pdfIn PDF document text
    • http://lewuxiboru.epizy.com/xigopibukixavor.pdfIn PDF document text
    • http://jonegukum.epizy.com/requisition_form_template_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/how_to_draw_resources.pdfIn PDF document text
    • http://riremeg.rf.gd/solitaire_cards_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/what_are_fixed_and_variable_costs.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/free_backgammon_game_for_ipad.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/what_are_the_keywords_for_compare_and_contrast.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/nickel_alloys.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_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 5424 bytes
SHA-256: 84a1242a306387000e382e572d5800891c17ff56114c80e2545285d0b28abb5e
font_01_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 11840 bytes
SHA-256: 99bfe76f70b7ac21751fac0f61c9d3fb70a049cea7f9d602a4097a46c0384a7a