Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8f9705beec97f0…

MALICIOUS

PDF

86.2 KB Created: 2021-03-20 08:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 25ba807d6be86786df2debbdc248e680 SHA-1: e674023d67647b5758fd9c57ea6bb23d272973e4 SHA-256: 4e8f9705beec97f06048f879906c20de42412af15028dfdc0b655d8319afd1ad
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of many links suggests an attempt to redirect the user to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=plantronics+backbeat+fit+connect+to+multiple+devices In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_600e65e229b1b.pdfIn PDF document text
    • http://stikc.xyz/stick_shadow_war_fight_apk_free_downloador6nb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5fceceda68e21.pdfIn PDF document text
    • http://kapubasezo.iblogger.org/android_onedrive_location.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_60525504e21ff.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/6q0hAhc/slick_slime_sam_sue_age.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/how_to_learn_engineering_onlineb6pnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5ff1fe21dc893.pdfIn PDF document text
    • http://zakababonedip.iblogger.org/66618528520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_602ea990d249c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_604ee97c42023.pdfIn PDF document text
    • http://allerlo.xyz/23075927838k1u79.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/JDmicPZ/vijatarigufuxowafulosato.pdfIn PDF document text
    • http://hotgirls.host/bijidakosigenesb2wok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_600dfe7c35434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5ff31cc105ea1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473415/normal_5fcd7f82251e2.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/where_is_system_preferences_in_settingsk61gk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogewarixisude.epizy.com/brother_in_arms_2_apk_data_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4e7f69-38bb-4a53-bac1-b5000d06f799/tujupu.pdfIn PDF document text
    • http://pumajuxav.rf.gd/alphabet_espagnol_prononciation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0ea6e1-3695-428d-9716-4055305e0f1d/xemodibeserorufopaxoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f8d6cd-6a4a-4859-bcce-5c32ec5f1f86/what_is_qualitative_and_quantitative_risk_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67aa7e58-c7c6-4182-9712-213610cf9ca0/star_trek_discovery_season_1_episode_4_recap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85681de5-167d-4e92-a1fe-c9489424929d/itil_service_transition_plan_example.pdfIn PDF document text
    • http://voxotili.epizy.com/consumer_awareness_meaning.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_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 5568 bytes
SHA-256: 59280f028dd6c683269dede00df65a34ad4fb0804e2600ba8be4af75111cd3c3
font_01_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 11804 bytes
SHA-256: d8d3468de8e7afa12926fbf03bc34c1cc0fd4f546ae16a04842b99345b5d3f24