Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8bfc8a5e7d19b9…

MALICIOUS

PDF

73.9 KB Created: 2021-02-24 22:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ebb20f8276f86b46618d1af9723bad5 SHA-1: a7151f98de7b9fa6a4e67db8b8b968a20bd018d6 SHA-256: 1e8bfc8a5e7d19b9d9434b37a801d1bced26b0fd481d22de9f42487a28622909
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains or using URL shorteners, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests it's designed to redirect users to potentially harmful content or for SEO manipulation. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=boy+scout+canoeing+merit+badge+worksheet PDF link annotation
    • https://cdn.sqhk.co/fuzokikili/UXANXjH/novarilokow.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/hohbieu/graphic_design_software_t_shirt_printing.pdfIn PDF document text
    • http://rudexikuritisi.iblogger.org/setc_bus_game_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vijasezadida/QgeNSY9/global_defense_zombie_war_guide.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/58d6f0aaa.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/cual_fruta_no_engorda.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/jjfyibX/basketball_swipe_an_addictive_basketball_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/zavonufovi/jcWduZy/39853217372.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/wolesotes.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/76ac5e74bf.pdfIn PDF document text
    • https://vutojexi.weebly.com/uploads/1/3/0/7/130776275/puvajivigejoxulo.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/ihhhPpk/pixel_zombie_hunter_apk_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_to_use_the_ti_30x_iis_for_algebra.pdfIn PDF document text
    • http://zawozunilutufu.rf.gd/android_mobile_restore_software_free.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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5768 bytes
SHA-256: ac565f31eb3d2b11812d071ad1a58201dbaffbfc47306ceef453b3057ac5c0c7
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10208 bytes
SHA-256: bc34c55c915d61961ec8c33cdffb54e5fae613522ecc61f151148e6b1b512aa3

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