Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43a74aa6c836913…

MALICIOUS

PDF

84.9 KB Created: 2021-03-04 15:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5d9bcc7a217c658b17864db1c07ad603 SHA-1: fee264f3e52a25e0ca4992c813b763d2853fd265 SHA-256: d43a74aa6c836913e46eb15d5afa10cf5eae62f7ef81459b5985ed25ff397baa
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 0.9998

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=nfpa+1001+firefighter+training+objectives PDF link annotation
    • http://goldstein.berlin/vcaa_biology_poster_templatey0dqa.pdfIn PDF document text
    • https://mitezexevas.weebly.com/uploads/1/3/4/5/134525922/3826379.pdfIn PDF document text
    • http://lesantyqas.online/83926120933parc6.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/744762.pdfIn PDF document text
    • http://jezakomesudo.22web.org/how_do_i_change_the_scan_settings_on_my_hp_officejet_pro_8600.pdfIn PDF document text
    • http://tamowigaxijatot.66ghz.com/sozuton.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/40334941289.pdfIn PDF document text
    • http://sezituza.66ghz.com/xevezoxa.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/ae06a2944a.pdfIn PDF document text
    • http://sosed.market/halo_2_android_apkpit7d.pdfIn PDF document text
    • http://help-ruleviolation.com/ribabuti54bdg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxagev.epizy.com/54775571549.pdfIn PDF document text
    • http://womutefipile.epizy.com/subimekejifigek.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/43851645890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb00223-4183-45a9-9933-253122785f3e/what_slows_gi_motility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9401f258-0d1a-418f-98f0-4082bdec2b02/le_petit_nicolas_louisette_translation.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/water_by_the_spoonful_full_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a55d864-7732-419b-909c-a5ce43c734f5/rarono.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/wasasaromokekanobatesig.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_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 5684 bytes
SHA-256: 24b5bdf7337511ae760ad7a70e4a501bdc2332503ac6e1d65cf07e98c54a31fb
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 10692 bytes
SHA-256: b6d1f76e8a9fa74250c590ee69a847addd555e360a21e6f3ff5bafd31d396874

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