Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fd9e4485947764…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 05:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eabe97168f143a938338fc222462d103 SHA-1: 28849c27972fe2798a398ecde2070978119653a1 SHA-256: 85fd9e4485947764a5fd9960d52799f07cb63a38428f8f6b6f4eec4ac17c120c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one heuristic explicitly identifying a malicious redirector link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of numerous links suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=portfolio+outdoor+lighting+wall+lantern In PDF document text
    • https://cdn.sqhk.co/xelajura/hdzJJgh/old_tokaido_road_map.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/VTCRa2J/sweet_baby_girl_dream_house_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_6036ca22f3adf.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/hcUupih/romubujixagonap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382414/normal_60033c7873397.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/orvihhc/minecraft_exploration_download_pc_free.pdfIn PDF document text
    • http://solavopuna.22web.org/biodiversity_and_its_conservation_project.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fc952231f40e.pdfIn PDF document text
    • http://paypallsecurity.com/vawemekibelipigedavevua9hot.pdfIn PDF document text
    • https://cdn.sqhk.co/sekopanosesu/jjoXja1/33688218835.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/fjhihjc/healthy_living_tips_during_covid_19.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/hg8MlNn/47559545559.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/gfhgeNL/revinureve.pdfIn PDF document text
    • http://load-bcp.com/englander_pellet_stove_25_pdv_factory_settings4rk9l.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/a6pbhcg/download_game_android_x_runner_mod_apk.pdfIn PDF document text
    • http://teenagetutor.online/landice_l7_treadmill_error_codesmmtjs.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/hgygeuq/business_management_associate_degree_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/he68Bm8/wupazifafonebuvij.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/ZjazPia/5211062998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fibotemirazopo.rf.gd/small_estate_affidavit_form_florida.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 4964 bytes
SHA-256: 11a402218d127303753747fe420b5a5429bf1ed4d304cc0a927dcaa95d73ed10
font_01_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 11604 bytes
SHA-256: 30a342ab64d8e3b1739139d1d65c8e400c68a550695723b7d346b3a05f33cbf8
font_02_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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