Malicious PDF — malware analysis report

Static analysis result for SHA-256 2287d22bf1c74913…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 15:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4289b10797ec8d66ce6126680b3bb8a6 SHA-1: addad57768764e6af646d181930aee7b1250c704 SHA-256: 2287d22bf1c749133b5a21c63c0649c2090678c257cad690faad191876b6e110
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic highlighting the deceptive nature of the document. While no scripts were extracted, the primary attack pattern involves leveraging these links for phishing or malware distribution, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=small+engine+manual+clutch PDF link annotation
    • http://yourbigdick.space/basic_calculus_grade_11_teachers_guideoj267.pdfIn PDF document text
    • http://acupofjacob.com/summer_infant_monitor_turns_off_when_plugged_incc9oi.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/egguhhi/merofaxen.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/0ngojbA/33321463211.pdfIn PDF document text
    • http://it50off.pro/livibuvavepemadexesa0vjhe.pdfIn PDF document text
    • http://zoo-taxi.site/rockwell_collins_proline_21_avionics_systemz3vx3.pdfIn PDF document text
    • http://fashion-deals.xyz/the_architecture_of_happiness_bookioyu8.pdfIn PDF document text
    • http://pmaider.com/how_much_horsepower_does_a_tesla_model_3_long_range_have8itbs.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ijabjgG/zesajetobuvosebaluxa.pdfIn PDF document text
    • http://espacecmb.xyz/westworld_theme_sheet_music_cello9berc.pdfIn PDF document text
    • http://zeropium.com/sniper_ghost_warrior_contracts_review_pc9phn6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_1ea34341bcd0410c83b7477563975206.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_93e8407a57494321b196f468e8e5adde.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_eed280fcca1545a5b796149fadcafa57.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_189acd7a0fa34fa9a29774b88881abf6.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_16308df63cde4ee3b0f22e736eb78365.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_55ce960c7d1d497e815e58604ad79441.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_ea85bc7366444271a5437438f3d3ee33.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_f0209e5afeaf426083a9d9474d43657b.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_eae835ebb52a41ad91aebed0a48fb03f.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_211fd1269e704257b8084cf9281ac85e.pdf?index=trueIn 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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5044 bytes
SHA-256: 22dd7db8269989a8d5726c2b05a33509379f1393445a89fde50ccb041374cae2
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10840 bytes
SHA-256: c84ab4f99b54f1dfd0b676a5e9a85e73410286d0fa909d9ab8c8c084c37998b9