Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c39c8f5dfbb2a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-21 06:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6ccb7d4af1008fbdf997edd374c79d3f SHA-1: 8e873ba78889aef39e96a3adf9c3b3289442e45f SHA-256: 3b8c39c8f5dfbb2af1c6cfa4a02c231e242b0d8d644ab63b256471f9b53e9023
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=human+resource+management+meaning+pdf PDF link annotation
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/jasogufarixeti.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/KjgQif5/touch_monkeys_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_6031afd764561.pdfIn PDF document text
    • http://xekizarobofoza.22web.org/low_calcium_oxalate_diet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5ffb7bf65f1be.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/iglulic/cdc_zombie_survival_kit_list.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/wiwiwavipolu.pdfIn PDF document text
    • https://mosaminaworite.weebly.com/uploads/1/3/1/6/131636744/pefik.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/novofoz.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/ibX3zjh/datijojiboposefom.pdfIn PDF document text
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/girazati.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/YjfQnjb/crashing_uk_season_2_watch_online.pdfIn PDF document text
    • https://navuvosukogeguf.weebly.com/uploads/1/3/1/4/131454151/gamabe_puzulufa_muzejutufemid_nitam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_601be293dbad6.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/rejukowawenujekeli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ffcdc2164d39.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/adj_uv_cob_cannon_manual.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/3419833.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/Rhcgc6H/steam_table_calculator_software_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegipufi.rf.gd/68115101720.pdfIn PDF document text
    • http://xeravujowa.epizy.com/lumisalonagikuzajimi.pdfIn PDF document text
    • http://wagupamodesugub.rf.gd/sprint_premium_caller_id_apk.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 5404 bytes
SHA-256: d0174643d5243d88a930af0a2c9748939c15e34534786a8a1fc5ba1cce1988f5
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10600 bytes
SHA-256: 3cea19b36a84b517c92bda35afdf4ba21f5d43b876b974b34e81142d663621e9

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