Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f16932990cd3470…

MALICIOUS

PDF

68.9 KB Created: 2021-03-15 22:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 84c1a1b11cd1f6a439f07c2b3b8b6d35 SHA-1: 1162a7e76b40943283ad17f4b3ee74e8e2317dfe SHA-256: 5f16932990cd34709e42632657201c30fac1db890bf3dae5c4fbb0c449075c91
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 0.9996

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://druttle.ru/strik?utm_term=how+to+charge+helicopter+roxter PDF link annotation
    • https://cdn.sqhk.co/zimuteraf/iajgx3U/hungry_dragon_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bodujemep/hfjjggA/fezurobek.pdfIn PDF document text
    • https://jujivonigipegi.weebly.com/uploads/1/3/1/4/131453429/wulusuxijulorugaliw.pdfIn PDF document text
    • https://cdn.sqhk.co/zozusexub/fuuid0o/87895017416.pdfIn PDF document text
    • https://gojijaxokan.weebly.com/uploads/1/3/0/7/130739343/lodoloroli.pdfIn PDF document text
    • http://nunobuzipame.medianewsonline.com/cambiar_de_a_word_gratis.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/zujamimozak.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/1kyNaia/ping_pong_rules_doubles.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/8738425.pdfIn PDF document text
    • https://cdn.sqhk.co/bejamisokepu/igdidhb/dragamonz_ar_battle.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/heVeIjh/sky_baron_war_of_nations.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/id6XGib/913204723.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/DAVxrji/9000675374.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/functions_of_tort_law.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/jiNEhd3/anko_wooden_rainbow_stacking_blocks.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/77ihcic/ramp_car_racing_stunts_fast_car_driving_adventures.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/Zjdjaid/47065470241.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/jarirotexab/photo_collage_maker_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/adicionar_assinatura_digital.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/nueva_biblia_de_estudio_teologia_inclusiva.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/85581351630.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/spotify_non_windows_store.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_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 5136 bytes
SHA-256: 74eb956e99ad69ee08e61011b86f78172354ea44320932ff1c711face348b0a2
font_01_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 11996 bytes
SHA-256: 0ee63f4ccd378b40b76483ca6387092b47ae95c3bbd8112b355c8b170dba781c

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