Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a8dc7979747a21…

MALICIOUS

PDF

74.9 KB Created: 2021-03-22 12:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b0b7cd2c5d54c7158836791428b6b5ff SHA-1: 1b9a1a0930699da9fff73ccefb97634535011c5c SHA-256: 74a8dc7979747a21d7661c818455ac4ae710a96437ea39135151e263dc217640
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://zajinet.ru/123?utm_term=ssc+stenographer+book+pdf+free PDF link annotation
    • http://copyrightshelpscenters.com/disneyland_resort_paris_case_study_answers9vtfi.pdfIn PDF document text
    • http://jadebey-x.com/liluwolip3gax7.pdfIn PDF document text
    • http://wisomudo.iblogger.org/60868592433.pdfIn PDF document text
    • http://pearhaidhr.fun/pizosemigodimewisoe7c28.pdfIn PDF document text
    • http://greenbike.shop/841794634kiqad.pdfIn PDF document text
    • http://istra-backwater.ru/71590142719yvcyu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusagijumetuze.epizy.com/handbook_template_indesign.pdfIn PDF document text
    • http://jimabepur.rf.gd/email_google_sheet_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa78703c-6cdc-48e1-a206-1d2019a6abbe/the_green_mile_trailer.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_c9a50abfe8754247a35a88f98ef4542f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/3612396125.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_0ed0217cf45c483aa7e963165c519dd6.pdf?index=trueIn PDF document text
    • http://mafonoxerinomif.epizy.com/maths_question_answer_for_class_9th.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/dog_sled_saga_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3503a233-dff8-48bb-9264-c6163195e8dc/nubuzuvar.pdfIn PDF document text
    • http://gimusatis.rf.gd/5354200462.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/90073761671.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/bekasurolesukofi.pdfIn PDF document text
    • http://jelamadigeg.epizy.com/beulah_land_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/80407452190.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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 5692 bytes
SHA-256: a4891029ca5b45db585b877cbfacea5117653c0a747df834372ad1c56bbef987
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10744 bytes
SHA-256: 647ff3ab745afef9124caec094ee1dbb1c430517d54f2d65f71b4811e7dd4d5c

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