Malicious PDF — malware analysis report

Static analysis result for SHA-256 61803983b22910bf…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 01:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aefa0fe1d6576b2abfd227942a2369ee SHA-1: 058a4658c38913e6e202ba80a3903bf6f2a1c98e SHA-256: 61803983b22910bf457ca1b211a92e0b748c283dcb01f0aaf7aacd50bc99ea99
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, likely serves to direct users to these external sites, potentially for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/award?keyword=ca%25C3%25ADda+del+cord%25C3%25B3n+umbilical+pdf PDF link annotation
    • http://lawexape.mygamesonline.org/59563492679.pdfIn PDF document text
    • http://sikazigazes.mypressonline.com/7991743807.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/gezvEgj/worusatupupo.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/22618082724.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/how_to_lose_weight_fast_with_indian_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxeje/dJxhjal/gutidopobudolalakamubopu.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/cambiar_formato_de_a_word_online.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/ieJjcic/horizon_credit_union_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/h94Bggq/red_buttons_shoes.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/how_to_turn_off_flash_on_polaroid_sun_600.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/dodisixojuleb.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/gjzhbFB/carrera_rc_battery_charger_7._4v.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/98874737389.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_edfb0b878dd8428d973efd24c2c4b1ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/microsoft_games_live_for_windows_10.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_044e0cfca62b4120bd5b20319596c6d0.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_579063b0b42042b8b35327bc18ec6d6e.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_833a0530a00649a48db8982ef625aef8.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_357d4258fbce4d8297fcc5286ae3c71d.pdf?index=trueIn PDF document text
    • http://kilarosine.atwebpages.com/fimimomemovopodulutadot.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/mugiso.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/30756024847.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_793930ab412a4c3085987c65d0f29b82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/80855064925.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_70ea84b0609f4df6b862dca4323b1d4b.pdf?index=trueIn PDF document text
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_b830efa286454332ad68ccd9d1c759a0.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_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 5360 bytes
SHA-256: 9af44af742bd618f316bf724cf6dbe1aa1fef6535943580cb6988e8e15e57b78
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 12568 bytes
SHA-256: 85e1d35cd3a5c8711f98ac431445a505a85a658bdcd9b4e75ea504a2193d9499