Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f7c7dd8430c265…

MALICIOUS

PDF

75.7 KB Created: 2021-03-07 09:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ed71ca13706036e8c6c948dca6f029d SHA-1: 135aa62945865de7afba239111309e44c5880999 SHA-256: a4f7c7dd8430c2654f8b17baf559d525cbe1cb92c8300f10bb53d4db346c2733
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=what+is+the+deprivation+of+liberty PDF link annotation
    • https://cdn.sqhk.co/biluvetizom/53jaheG/off_road_military_trucks_for_sale.pdfIn PDF document text
    • http://ostanni.fun/what_type_of_heater_is_best_for_a_garage4szdm.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/lazarillo_de_tormes_completo.pdfIn PDF document text
    • http://viwimewi.22web.org/lakewood_nj_crime_report.pdfIn PDF document text
    • http://academic-club.ru/kudolaxonukeviwokekumrftfp.pdfIn PDF document text
    • http://vehicleinsusa.com/who_makes_the_best_hot_tubs_in_canadadg3yn.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/relipis.pdfIn PDF document text
    • http://stavki-na-sport.site/vizumobibhw3mg.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/dibaigY/82700139232.pdfIn PDF document text
    • http://temppicture.xyz/77691083122rz8qz.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/nudubuparugorimoxitixiter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisetekotixob.myartsonline.com/expository_non-technical_writing_sample.pdfIn PDF document text
    • http://daremafuxabo.rf.gd/79146206870.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/rimonajijafusid.pdfIn PDF document text
    • http://nunevubedodunu.rf.gd/how_to_tell_if_refrigerator_compressor_is_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/19559341272.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_58045ba3946d47aa900f87916810284a.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_71fff062b8d743e694e3ed4963437a0b.pdf?index=trueIn PDF document text
    • http://fevedudebe.epizy.com/how_to_set_up_american_hunter_feeder.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/faux_leather_sheets_afterpay.pdfIn PDF document text
    • http://bitoliwutusire.epizy.com/29498527167.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/integral_calculus_problems_with_answers.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_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5444 bytes
SHA-256: f3eafac22163d337bb0526d2fed1bebba162dc6093dd0fcc68bf87b7445913ee
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 10136 bytes
SHA-256: 5169a1f80a71e808588d88f117f6318b4c30e9e60336b2f60f63415f24deb7c4

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