Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96208ec445caf5b…

MALICIOUS

PDF

83.2 KB Created: 2021-03-18 00:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 887d6877d57a94d9c7e71662c0f58bf7 SHA-1: 8d7dc614d6100bc950824668b2b2c773243a64eb SHA-256: a96208ec445caf5b06576d5955abf307d67a1d3ba0e81eba94d53cc0e8c307e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=hsc+biology+project+pdf PDF link annotation
    • http://tiktoktop.design/nidelepas95eia.pdfIn PDF document text
    • http://vittorguxx.site/veramuzanerazizatorepejr1.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/gituxiberavuledosavi.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/english_dictionary_in_telugu.pdfIn PDF document text
    • http://regsenatvumen.website/playstation_2_bios_filesytnih.pdfIn PDF document text
    • http://espaceabonnes.com/vilonaziriwaperecxl65.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/apa_citation_manual.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/bsc_zoology_honours_book_download.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/pharmacotherapy_a_pathophysiologic_approach_9th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e3f515-431f-4abc-802d-ecb76d31beff/55180999659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe96d467-52d6-4ede-9714-6c9a3aa13a6e/21037549683.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_0707d7d35bc7455f9d29ac90f3898f99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/025d7516-6826-4fae-9d3d-b698807cea11/how_much_does_a_teacher_earn_in_south_africa.pdfIn PDF document text
    • http://satovimowenijor.myartsonline.com/30847523286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d14d439-8833-4aee-95da-63512a474d69/watch_twilight_breaking_dawn_part_2_free_online_no_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160deb68-2418-40e0-890c-bff8d05be345/sofegenujakewezurinesob.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_c1ad8d1841b2452d969a3322d2702828.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90ec5e7-a292-4bce-96b4-9ef8cb75760b/2560866308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b807d17-e3d2-46d9-9399-26a015f3d59a/marvel_movies_and_tv_shows_in_chronological_order_2020.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_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 5392 bytes
SHA-256: 3670a9d131212ed880f8d21498da544df2358ffbc437e9acfe856c44effe8411
font_01_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 11660 bytes
SHA-256: a25a0eb4fafe20494d36ec08bbdb430b67a4cefebdbbca032009628ee9bce498

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