Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ff51cadb0cea6c…

MALICIOUS

PDF

67.5 KB Created: 2021-03-19 04:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 43be1a7a87ce402b1f4b129c281896b6 SHA-1: 521b73f8567799e8da4834d949f6faf1783c50df SHA-256: 56ff51cadb0cea6c13df76481f11a62f79ef19ac24d91c66a8bd906701439e8a
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-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://jacksth.ru/aws?utm_term=algorithms+dasgupta+solutions+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/jifedibodo/f5jjDhe/gumofitusixi.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/bjcThhr/jon_boat_livewells_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_601f3af6c782e.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/Jijjg59/marapidirozibewuniz.pdfIn PDF document text
    • http://doucheop.xyz/xufunovivumq1kt.pdfIn PDF document text
    • http://kushtanash.ru/nolurokulekojidamum3693p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff5d8832a185.pdfIn PDF document text
    • http://alifan.store/blank_map_of_canada_printableq7r66.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/public_speaking_merit_badge_pamphlet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_5fe732a3e9cc9.pdfIn PDF document text
    • http://trokot-roznica.xyz/51773080151gh2il.pdfIn PDF document text
    • http://russianpatentexpert.com/podejilowavejepudulakiij38w.pdfIn PDF document text
    • http://mainsale.info/sniper_jungle_commando_counter_attacks2grnp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_600a75c0e8801.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekemelegewimo.atwebpages.com/lefexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6524e2-0b52-4b1f-aafc-ec9a1774d9ac/par_quoi_remplacer_le_beurre_de_cacao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53268aea-c07a-4e13-b970-b7472b641af3/tom_big_al_schreiter_scripts.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/geometric_dimensioning_and_tolerancing_symbols_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5704e7c-7a1d-4e29-8fe8-4be40508b7bd/giwubenekodevukapubunifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bb7d35-cb29-45d5-932a-9e78dbe357fb/bukumojuwuwajupexovosoko.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_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 5444 bytes
SHA-256: cbb025ce4003c59adb670b8a3248f250c666ccd9c8dffeb30b4bf63460603180
font_01_sfnt_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 10516 bytes
SHA-256: afb1a9972f7c9c50c927904c828e739e939d5034960ca830781f899f82737d98

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