Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfdcd164a1ae849…

MALICIOUS

PDF

72.8 KB Created: 2021-03-12 06:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 59829ff5cb2e6ffd622c173cce029a7e SHA-1: fe343d456806e38a638159197213f91fd011118c SHA-256: 4dfdcd164a1ae84916c6df4bf43644082db066830882c80ccdd53303454c3067
206 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. It uses a callback-phone (TOAD) lure. 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 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/award?keyword=abbyy+pdf+transformer+full+programlar PDF link annotation
    • http://devivitonewe.sportsontheweb.net/fusionner_plusieurs_adobe_reader.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/negilukoxus.pdfIn PDF document text
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/1057a.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/metabolic_syndrome_risk_factors.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/ihfsmQT/junior_graphic_design_jobs_maine.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/analiticka_geometrija_u_ravni.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/ZhaTqhi/87834009245.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/icKgjgi/real_racing_3d_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/FhgYhif/rakemevoduxe.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/lWiifgd/sustainable_development_goals_united_nations_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/aPojjZ5/90260972060.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/1842896.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/gWhfja6/hd_forest_wallpapers_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/Wibogcy/las_vegas_tourism_guide_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/geohjvM/final_fantasy_brave_exvius_awakening_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/aVnpv1G/dwight_schrute_car_gif.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/nuwojumurojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_8de4a7c307d9480d95a93656de7e9e81.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_13e176f4a87f47479d7542cd8736174d.pdf?index=trueIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_99a1b012c0e946b998d420ee40c3b3cd.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_9398e01873d940d79555895cdcdd0172.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_4ab037bb95184215b30158bb0eaf887d.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_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 5592 bytes
SHA-256: e6b4eff92da84488875054eba208dae7936cd2cd86cfb7fbc7c25405e7d7e29f
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 10980 bytes
SHA-256: 7ea75e4d3c4ff9c0df277398fa522551d0862d0700b37e1440f46f71ec053c15