Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81e151cb1d7c4e5…

MALICIOUS

PDF

72.8 KB Created: 2021-06-09 11:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc0aed861b24cbef05cb0234f532a343 SHA-1: 2ee21cfee21dfd7e6bac55381de017fde867cce1 SHA-256: f81e151cb1d7c4e58af75f86d2b553652d986cd02e77948d0fa2336f9a17a1e1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, with one specifically pointing to 'chcial.ru' and another to a 'weebly.com' subdomain, suggesting a phishing or malware distribution attempt. The presence of many links on disposable hosting further supports this. No scripts were extracted, but the overall structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/pbw?utm_term=free+math+sheets+for+1st+grade
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/soruw.pdf
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/rurosedijatomamexoj.pdf
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/wajojenukusosaz-tivin-gujasuzita-sojabonobojaw.pdf
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/3ddefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ronuzexem.pbworks.com/w/file/fetch/144427506/amazon_blue_badge_conversion_2020.pdf
    • http://detomipipu.pbworks.com/f/suluxagosazo.pdf
    • https://uploads.strikinglycdn.com/files/e320adda-432d-44ea-92de-29a216eee0ef/bufowekegasorixe.pdf
    • http://jagimikat.pbworks.com/f/what_is_the_brand_code_for_sharp_tv.pdf
    • http://furalagaposu.pbworks.com/w/file/fetch/144678828/adobe_photoshop_cs3_tutorial_malayalam.pdf
    • http://zopujoxobug.pbworks.com/f/when_is_s9_plus_getting_android_10.pdf
    • http://tevimunon.pbworks.com/f/39949776504.pdf
    • http://mujefefimuf.pbworks.com/w/file/fetch/144880620/19107707829.pdf
    • http://minuwaxiper.pbworks.com/w/file/fetch/144937764/gta_5_visa_2_apk.pdf
    • http://vibevekofano.pbworks.com/w/file/fetch/144426219/sorofop.pdf
    • http://pisaxolakek.pbworks.com/w/file/fetch/144719757/99361055118.pdf
    • https://uploads.strikinglycdn.com/files/9845c2e6-6616-4c94-8927-767f0d7e5f2e/el_seor_de_las_moscas_personajes_caracteristicas_psicologicas_y_fisicas.pdf
    • http://sazupamufode.pbworks.com/f/akademia_pana_kleksa_caa_ksika.pdf
    • https://uploads.strikinglycdn.com/files/b1c5737f-64da-4f44-a287-aee40b10602a/xejamobajonozuligeme.pdf
    • http://risuxujuvu.pbworks.com/w/file/fetch/144483414/zezubo.pdf
    • https://uploads.strikinglycdn.com/files/2c2c0740-0d88-421e-b9ae-420d0580b822/migodad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ce.bin
af2d6a140fb10e43b9aa195ba4d12330eedbfb1e6ff574609c2543e7fd936410		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 5296 bytes
font_01_sfnt_off0000f2a8.bin
b4ab37c030d49fef701873da1cf323b21eaf42eae81cc25e191f5089e99311b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 10364 bytes

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