Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c9383c44c17cab…

MALICIOUS

PDF

80.5 KB Created: 2020-11-24 00:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: da28d9dcf87925d929dd0618f8862737 SHA-1: b94ecaf6c54ab1e78817cae246fc29e988b97a8b SHA-256: 99c9383c44c17cabd6575754e52b34d7a9e1796a3e0867cf1500031ec67f7212
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 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.
  • 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://trafffe.ru/strik?utm_term=def+jam+fight+for+ny+the+takeover+is PDF link annotation
    • https://mejiwixibunoxu.weebly.com/uploads/1/3/4/4/134402053/verofiki_popetaluron_busetakinozujud_numivabeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f9de952857a7.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/4ad2f45.pdfIn PDF document text
    • https://sazujusa.weebly.com/uploads/1/3/4/6/134632778/libosoxev.pdfIn PDF document text
    • https://zesojewati.weebly.com/uploads/1/3/4/4/134432656/faacb8c.pdfIn PDF document text
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/meweseraneso-natupemiliwa-dipizubazo-kudadafexipaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/zitowikor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17a10b7-fb07-4121-95c6-0e04e15ec923/expedient_data_center_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a8d52b-d2bb-45c7-bc0e-7a8b9fb5d897/minecraft_oturma_modu_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/allegiant_divergent_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/farewell_speech_for_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/plate_tectonics_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/mukileduwikurozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be247d8-057f-42e7-a8b1-8a306375b444/lezuvoxinatepud.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/60015389356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc4f540-95c3-4a88-9a05-fc36299684a2/mcmillan_middle_school_summer_reading.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 9892 bytes
SHA-256: 674808f1a4b5102c978f047164667001ff04f60ada09a536333b23c708421586
font_01_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 5448 bytes
SHA-256: b54fbba55380ef47ea2950b3d5f38e44e6935ce341fa657eab31ad21afceef09
font_02_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 12336 bytes
SHA-256: 88d725166b337f09f98f8ef75f928dc9691a1daceaab39fee1f93eb4e8d6471c

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