Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80ee8cec9c7c3fd…

MALICIOUS

PDF

77.2 KB Created: 2021-02-25 19:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 12c032242f4a1c9d683898642ad04a48 SHA-1: 94c857364a68d46aaac135f9609d3f51a9f9a2ff SHA-256: b80ee8cec9c7c3fd80039c191f7748ff5a398851185bb2d6d0fdf21203f70f95
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary indicators are the numerous external URLs and the heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/award?keyword=sony+str+dh810 PDF link annotation
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/vezakufonis_bomusefi_potonom_jajolani.pdfIn PDF document text
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/milodiburuv.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/hfN31wO/e_wallet_apps.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/sisabipo.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/Jgjjaid/rc_flight_simulator_mac_os_x.pdfIn PDF document text
    • https://zoluwapipapak.weebly.com/uploads/1/3/5/3/135321816/lojekotutufe-xamuv-jajudujar-bifepejuwa.pdfIn PDF document text
    • https://patelevikukel.weebly.com/uploads/1/3/4/6/134665122/gewari.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/wevowi.pdfIn PDF document text
    • http://insuranceautousa.com/tasamjzw3o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374009/normal_5fed3a4ea9b9e.pdfIn PDF document text
    • http://kixogabes.22web.org/anatomy_books_for_physiotherapy_students.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/gdhfChh/cod_warzone_bunker_codes_stadium.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/99c77942d0eb0c.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/hcrA726/first_grade_math_worksheets_counting_by_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buletamapa.rf.gd/whats_the_advantage_of_tidal_power.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_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 5264 bytes
SHA-256: a06a6ef55e9f19aad178dacf369cf1d53c403f070a037f765e80519dbe06fa49
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 10004 bytes
SHA-256: fc326caea61c9deab4eec5636b734afc55117ad12712a176894d4a6e175c1ad7

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