Malicious PDF — malware analysis report

Static analysis result for SHA-256 244bec607960d8e0…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 05:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4710bfde3d561f60728108ffa2698d8f SHA-1: 17bf07611d534a55013851f220d7cba64d2c727f SHA-256: 244bec607960d8e0107d0d4d9399d0cfe61c6556d4f70c0199f85ff8cd1faa79
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://jumiwimov.ru/strik?utm_term=john+deere+455g+reviews PDF link annotation
    • http://kuvenumine.mygamesonline.org/probability_formulas_class_12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_6042ddf568e8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6014acdc98460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_604b7c3c4a47d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_602ed064699d8.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/Khdhfgf/97986488174.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/tenujuzivisokoxuzazisu.pdfIn PDF document text
    • https://cdn.sqhk.co/bapinero/jdiarhi/cetusplay_apk_pure.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiferufefu/ahdjfjg/formal_dresses_near_me_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489994/normal_5fded67718809.pdfIn PDF document text
    • http://jarokixepoweso.mypressonline.com/vugixezudefivopozemiw.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/DihpjbO/88758234736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_603cf52f721f3.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/65813698627.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/dodge_stratus_2006_battery_location.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/centralismo_en_el_peru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_5fe9c9575a98c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_60489317c7fe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekamidakoj.atwebpages.com/gavuko.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/how_to_change_fios_channel_without_remote.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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 5196 bytes
SHA-256: b45bdc3a1269e1e19751af29d976e867352511a9fff100e878569e6ade8d2d2e
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 11212 bytes
SHA-256: 9705fa47ff8014293b2cea37ba924e79343c37b7d67b9077b6b4c3ff6ec062a5

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