Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6259442f691ff25…

MALICIOUS

PDF

79.7 KB Created: 2021-05-13 06:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef55e0d0e8bd00ad461180e15cf45ee9 SHA-1: daff94062685ca95b69125b669bc67bbb9e40054 SHA-256: a6259442f691ff25c8ecef37558789c16e77f3af4ea8358439a104334b7232f5
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 0.9997

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://baarspo.ru/strik?utm_term=dyson+vacuum+filter+cleaning+dc28 PDF link annotation
    • http://misujupino.getenjoyment.net/8682742948.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/idTgg3b/romancing_saga_2_vita_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5ff2c4c22d5f6.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/ropiwukukag.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/BhjgfC2/functional_fitness_training_exercises_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/hdCxjgN/2_player_game_lyrics_be_more_chill.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417986/normal_60055c7f11dda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/forupokisip/fodowiriwoxaponiwakamejov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f9f290-1572-4500-84da-1af498ca812c/bonuzokugapemedopipedok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838f4c1e-03d3-4656-97e6-4528b7507f9e/jadegujejarugexew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe823d55-a554-4c75-a3d8-c712faa04246/86972828605.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/49965343517.pdfIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_1e1d4ec41c204d1b9147e047e9832471.pdf?index=trueIn PDF document text
    • http://xifimerin.onlinewebshop.net/botany_quiz_questions_and_answers.pdfIn PDF document text
    • http://dafuwinev.myartsonline.com/el_cambio_climtico._una_realidad.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_8fa7607effa347a8a2ef95791177dbe1.pdf?index=trueIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_51f3fda593bf4828ac537d4f7b9bf1db.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_41b2e710254a4bfa87e446eb514d6fe8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee4067a-bf21-47d0-8ebe-7df398af1b72/6.0_powerstroke_horsepower_increase.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/ultimate_shred_reviews.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_a8034a1ad48c4b65b6f5ce025691f88d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5f3add-8b79-454d-9bd5-b6e0fbdf3698/xetizerupo.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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 5828 bytes
SHA-256: 50e77462e57921ec14bf154ca132ffbdb1773af03f4715d058c98a19841fc14a
font_01_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 10700 bytes
SHA-256: c37ed9fc48b60f79509c640061abec32e372ca9d64ac1d0e886e3382f6ac6261