Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4028f257c6a847…

MALICIOUS

PDF

88.8 KB Created: 2021-05-02 16:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cbd105360a9acdf7376a5539e1adb98 SHA-1: 93ff16b40d637d050f82929b04bf17f56e727af3 SHA-256: fd4028f257c6a847388f0db770cc31792b48d33ec2f1262194b32f48f0bd3477
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://pelibifir.ru/strik?utm_term=how+much+does+it+cost+to+run+a+1%252F2+hp+pool+pump PDF link annotation
    • https://cdn.sqhk.co/xumirikebixo/igt8qgi/lyrical_lemonade_sweatshirt_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/nujodusuwud/hbRjhge/jamedenasamopamitaxibug.pdfIn PDF document text
    • http://samemere.mygamesonline.org/neet_biology_chapter_wise_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/ucbhiib/infinite_flight_simulator_full_unlocked_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/hjaDQjc/risevametalipavafinebopi.pdfIn PDF document text
    • https://cdn.sqhk.co/saxamabewido/jiMzBco/13625328959.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/9jf0h0T/faxapififeg.pdfIn PDF document text
    • http://legalvictory.group/411484157434ug0f.pdfIn PDF document text
    • http://on-arenas.com/50396637500mbc3h.pdfIn PDF document text
    • http://ersoil.fun/kotegejijuwoxigufanidpzblj.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/8tjhifS/peter_rabbit_adventures_books.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/gggji0b/freehotelcoupons_com_tennessee.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuvebafo/iagjvie/award_announcement_powerpoint_template.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/ibNBXjf/gujinalivip.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jc5hdjb/87277500970.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/english_nursery_rhymes_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/LgdTha8/vepegevakolenutidutuvos.pdfIn PDF document text
    • http://d-youtube.com/661846052180fk49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_9ee4861a671b44079fa57bf67ccc54c1.pdf?index=trueIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_61bb9448a58a429dbdca2e1ed9dad011.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_7e11fc28fa674843877dbd757a678f67.pdf?index=trueIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_2a6e2567b83a4005bccbcd186cea39f3.pdf?index=trueIn 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_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 5584 bytes
SHA-256: 827f487c3577f602378bead9a520ede5e13bb519f5b03098d55e8d0034c3f514
font_01_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 11676 bytes
SHA-256: f80b31d5049963e5008adbc34de0d79d5aca0528b49cd5839f2e45510e2a1a1f

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