Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bcb9cca031d032…

MALICIOUS

PDF

89.3 KB Created: 2021-05-31 21:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 601281e6dae02d1d8deaafa7c224b435 SHA-1: cf409ea80c7c3d4fae32102b39ae1045b567af0c SHA-256: a6bcb9cca031d03252a91a5dbf755590b5446cec2f92f7587df291be129b2a35
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('crysiq.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://crysiq.ru/pbw?utm_term=isosceles+and+equilateral+triangles+worksheet+key PDF link annotation
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/jiwikozakos_jatajova_wavapotudaledas_levutevora.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/1110f02b0a227e.pdfIn PDF document text
    • https://radamafusutu.weebly.com/uploads/1/3/4/6/134668344/jivedesupabixalila.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/cd3f249c.pdfIn PDF document text
    • https://tabikanopik.weebly.com/uploads/1/3/4/7/134705808/5854346.pdfIn PDF document text
    • https://gorokose.weebly.com/uploads/1/3/4/0/134042322/purako.pdfIn PDF document text
    • https://pozetegafikule.weebly.com/uploads/1/3/4/8/134857311/6490958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144415866/tisotutixapexupupa.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/bemivovebezejipe.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144418773/83143598251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d6227b-f93f-4bcc-9414-501139e9b22d/twilight_movie_2011_download_in_hindi_filmyzilla.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/imyfone_d-back_registration_code_and_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee49e376-6963-44d6-9baa-73b5843362cd/pevobulavowubomabogisuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1551998c-3a52-43b4-bec7-e0d63b67b44b/how_to_use_obd_diagnostic_tool.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144418224/dupojojelipasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46477ac2-a035-4382-bb83-c4f36af843bc/sulokuguvivaletofivijaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8497ea-3ab5-46d6-9704-a5db2e42841f/10.snf_corafya_ders_kitab_cevaplar_meb_yaynlar_sayfa_62.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/w/file/fetch/144419889/what_do_the_numbers_mean_on_italian_pottery.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422955/benvolio_and_mercutio_relationship.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/why_the_hell_are_you_here_teacher_unblocked_reddit.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/toro_ss5000_drive_belt_routing.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144421191/rules_of_exponents_n.rn.1_worksheet_answers.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144415707/73904403338.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_off00011e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E85 5524 bytes
SHA-256: d2cf6abde37e95f7b26550507b80ac34f619a39af10fea987207a0b4adf9dcd5
font_01_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 11348 bytes
SHA-256: 5dfad7c59307216d11c2a471351c463c5295e17f683be68b1d11eb77b71c8ee9