Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dc91379885bfb2…

MALICIOUS

PDF

92.0 KB Created: 2021-03-22 05:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e7b1ec1a998e9b1c2110b68e2cfe5d54 SHA-1: 5f9cc4d3cd560fc1a02a9731cbe23b775fb405b3 SHA-256: f1dc91379885bfb2bf641626a91fed22edc458350beaab2208ac08fd3b84b604
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://midufefew.ru/strik?utm_term=robin+hood+prince+of+thieves+cast+wulf PDF link annotation
    • http://xigulomu.iblogger.org/26748620447.pdfIn PDF document text
    • http://patokog.22web.org/pafumututokokajad.pdfIn PDF document text
    • http://jimurizo.22web.org/85038707309.pdfIn PDF document text
    • http://bu-markett.com/hookah_bar_video_song_3gp7iq7v.pdfIn PDF document text
    • http://gnfcns.info/farming_simulator_15_xbox_360_cheats_codesnlafw.pdfIn PDF document text
    • http://datingdate.site/overhead_door_legacy_model_696cd_b_manualuexih.pdfIn PDF document text
    • http://zijiwox.iblogger.org/94654325794.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/2_fold_brochure_templates_microsoft_word.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niworojuxine.rf.gd/event_agenda_template_ppt.pdfIn PDF document text
    • http://bojakevu.epizy.com/42755973620.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_c696f1febf724b91a5922cd221009caf.pdf?index=trueIn PDF document text
    • http://roworozirad.epizy.com/76677200948.pdfIn PDF document text
    • http://garulolit.rf.gd/34083934919.pdfIn PDF document text
    • http://dusexodabedokak.rf.gd/learn_python_tutorial_for_beginners.pdfIn PDF document text
    • http://zodadep.epizy.com/septa_128_bus_schedule.pdfIn PDF document text
    • http://romamosok.rf.gd/fifemoduwirurolodif.pdfIn PDF document text
    • http://gepobot.epizy.com/5888647309.pdfIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_7120bed05eb34fe7b2113a118354bfc5.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_58d05768cf0d4427a118efa93afb3262.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_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 5544 bytes
SHA-256: 30678201019c8470e318e4dfa35b30b2ca2be8fbbbaefd0bddcb2431081b4ebb
font_01_sfnt_off000138f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 11776 bytes
SHA-256: 79c81d245d111658c5329ccf24e143a8f4dbf2773470884b89f0d34935a8319f

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