Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3bb44ab1bd7c84…

MALICIOUS

PDF

80.9 KB Created: 2021-03-05 04:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f74f91bfe012b853a38b7ae6af5ae2e SHA-1: 947f9310d83e891988d8f7e260699a5aded533af SHA-256: 5f3bb44ab1bd7c84e4b43230e800f4be784f6572cf36f80dd5e88733c541248f
186 Risk Score

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 0.9996

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://xajibur.ru/wix?keyword=how+to+use+t+table+stats PDF link annotation
    • http://vevaxogejaz.scienceontheweb.net/minolta_srt_102_review.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/OnF0igK/best_catcher_pop_time_ever.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/jd9wih5/37116001743.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/90296623125.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/what_do_we_do_when_we_feel_nothing_lds.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/wahl_clipper_guard_sizes_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/gWGgcjd/ol_chiki_download.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/xukokudefisapowasokop.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/YibeFJj/56703068366.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/ijchhtR/first_aid_beauty_honeysuckle_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/ijZjegc/watodumuragedala.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/ghZb7CX/glitch_wallpaper_iphone_11_4k.pdfIn PDF document text
    • http://fujubipe.22web.org/22162671104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_35bf73e32cbb47bea7dcd01983733b85.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/personalised_twas_the_night_before_christmas_hardback_book.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_9d4ea3595bd9422a9590470c9fb29beb.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_438a429941a04ccc84cc4c24552e4de1.pdf?index=trueIn PDF document text
    • http://rewuwuja.onlinewebshop.net/how_to_weight_train_for_weight_loss.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/nazezop.pdfIn PDF document text
    • http://judixipe.epizy.com/pirates_of_the_caribbean_song_piano.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_ff75d8f88e0e4bd3bcb0fa8d74952475.pdf?index=trueIn PDF document text
    • https://www.cancer.gov/coronavirusIn 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_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 4776 bytes
SHA-256: 878074495c075c2974c07e584fcd92d54b2d51cd3fba2b84c7b9e793dd55a547
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 11516 bytes
SHA-256: 74a1282f0173b667f2685276854458aad6cf9871bafee65d1db7c11f4225d3c7

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