Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e0efc41fa51c87…

MALICIOUS

PDF

75.5 KB Created: 2021-03-06 14:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 938cc395e6ba0f9a7dc59885547949ee SHA-1: db1d9a8118f9ef30a7bf5ddf16c21909a73e787c SHA-256: 67e0efc41fa51c8752b297fd00ddb939dd0aaed81ca15ee21cfe2faf6067052f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://yafferge.ru/award?keyword=java+swing+project+in+eclipse In PDF document text
    • https://cdn.sqhk.co/zujomawa/VylAZje/kozerabizerobo.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/guxusedige-xililowu-legad-tuwowubuzobana.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/1582794.pdfIn PDF document text
    • https://fogisavelubid.weebly.com/uploads/1/3/5/2/135299906/ccca74145c6.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hjblLvs/zeds_dead_pulp_fiction.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/heCsPia/sexamibuzuludido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_600b4c80b3085.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/LVjgjex/race_kings_mod_apk_data_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/3ievyid/picaporte_para_porton_corredizo.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/1icNxhg/38336139500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_6018db1bb4504.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/bilimikejelesak_xufirej_nusubujezudo.pdfIn PDF document text
    • https://manasuxejorodi.weebly.com/uploads/1/3/1/6/131606962/8fe3e4913c6be6.pdfIn PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/7449817.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/hBjf5Vd/baxovepuwilamagevepaz.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/masutemuferig_povodar_tivesamoxi_kizagogigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5feb69110496b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efdef17-0526-45e2-8361-15180d96b6fc/how_to_read_a_poem_beginners_manual_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eeb9ba-ae92-4274-8f12-df61bbcdf2c1/how_to_install_sony_soundbar_with_wireless_subwoofer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00378590-4ea8-4c1d-8ad0-985bc218360f/98879061441.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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5320 bytes
SHA-256: 40c3bc7699af3407da019995aaced63baaecc2008f48f159e252cb40f9ad8b88
font_01_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 10032 bytes
SHA-256: 87abf72544a2ebcaa285929056c279dcf72346da924c21ad906a78b762ddc0b1