Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd85c6996f606c2e…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 18:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a86ea78e78407509f996f39f57ad5ec1 SHA-1: 57208d504f0e801c9deee86f11a025f01b089987 SHA-256: bd85c6996f606c2e6d4987d4e95a2f5fec9bd52d4589a94ec529ef6d97a7238e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+to+clean+a+breadman+bread+machine PDF link annotation
    • https://cdn.sqhk.co/femelofep/hbhmBgg/nuclear_weapon_definition_physics.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/xjaifjg/hurst_competition_plus_shifter_identification.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/yo7tAjd/traffic_rider_hack_android_download_free.pdfIn PDF document text
    • https://zabivavisona.weebly.com/uploads/1/3/1/4/131452967/pavebufezifupadezi.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/58063020751.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/b1RY3rb/pubg_tournament_app_aia.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/H53ggij/love_island_the_game_season_2_noah_route.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/2382388.pdfIn PDF document text
    • http://datovufes.scienceontheweb.net/22925971313.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/Sgfjbji/fewalalifonejonitugorol.pdfIn PDF document text
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/8eb907d.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/egiX1ib/mezegetozajiwizepeb.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/satudifin/protein_synthesis_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/cycle_stunt_games.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/34385730557.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/jorurofetefuduripobi.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/john_deere_mowers_at_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/setivepup.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/27450800960.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/asc_timetables_2019_full.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/rinenedabit.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_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 5192 bytes
SHA-256: bde09f90c5d9384c14a075c017e3992a4ac413a61ac0c7be45e779b42aa67dec
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 10276 bytes
SHA-256: e3a9d61f1530592b11a37a31d9cfa4e85c4277f59c8f18c3c82e9deaab79b955

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