Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b4ec368f44e96f…

MALICIOUS

PDF

79.9 KB Created: 2021-03-12 00:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6ac57cc10e4f972bfc48339681fea25d SHA-1: c679a67a2572553120eede8f8e9c47a3d019cb63 SHA-256: c9b4ec368f44e96fc8a8f845346bbcda1513117737652af67b0717e6d32aa1b1
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 0.9996

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://jottigo.ru/award?keyword=anatomy+of+human+spinal+cord+pdf PDF link annotation
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/d30eeea91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_603e27cf18e94.pdfIn PDF document text
    • https://kumisorulilinim.weebly.com/uploads/1/3/4/7/134750082/mozitepifoxe_fexutetijenav.pdfIn PDF document text
    • http://dragonflysagewellness.com/your_wish_meaning_in_bengali1xdyy.pdfIn PDF document text
    • http://italywow.space/beauty_plus_latest_versionwihl2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461211/normal_60038730b2d8a.pdfIn PDF document text
    • http://vobefoli.iblogger.org/which_bluetooth_speaker_is_best_in_india.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5ff5adbeb4d1b.pdfIn PDF document text
    • https://fozipapuratub.weebly.com/uploads/1/3/6/0/136088586/9855278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_6019cfe0e44b2.pdfIn PDF document text
    • http://academic-club.ru/minejuxusiwarilebogewa3bz8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_5fda0ecf870be.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/brookfield_property_partners_annual_report.pdfIn PDF document text
    • http://electriccannoz.club/goxupekutawuzezirimolok10fp.pdfIn PDF document text
    • http://subbellassecret.com/everfi_module_9_quiz_answers_quizletkvkcl.pdfIn PDF document text
    • http://plsale.pro/898329098593ss69.pdfIn PDF document text
    • http://hrushch.space/antigravity_musclesqu5yh.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/sefabe/goworegevazuludejuvirex.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/57019300025.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/xajolawomanivaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/magnetism_worksheet_third_grade.pdfIn PDF document text
    • http://lujifub.epizy.com/4882151912.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_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 5484 bytes
SHA-256: 645aebaa3333cc26c048740f8614056d0eacd038d9a945984aeb828c488988e3
font_01_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 10136 bytes
SHA-256: 36559f671dbfab5c89d8579733f3f61da5749fbbae60316400b9ce58c0c36754

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