Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee99cdbe1cade9af…

MALICIOUS

PDF

88.2 KB Created: 2020-12-27 02:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ed3b5a13e0bbf0e482e007d2233d7971 SHA-1: 7c2ab1810bebb9a300c908646aceeff4c7b754f2 SHA-256: ee99cdbe1cade9afdce7d51d969e5ede84f7c89c10eae9ad616dab0cdb082769
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable hosting services, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the primary URL.

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://traffset.ru/123?utm_term=teddy+ruxpin+answer+box PDF link annotation
    • https://sitotibaw.weebly.com/uploads/1/3/4/7/134752740/f7aeb82af2c7.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/8241557.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/weborexutut-siwepa-garalizosa-kabifojedad.pdfIn PDF document text
    • https://tenadugal.weebly.com/uploads/1/3/2/7/132740541/kajilawexufijupif.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/2421546.pdfIn PDF document text
    • https://tedowinoni.weebly.com/uploads/1/3/5/3/135304389/7951963.pdfIn PDF document text
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/voditap_virudupej_lonasetesep_jaxenowuje.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/y94Nhf4/guilty_gear_bridget_combos.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
    • https://uploads.strikinglycdn.com/files/ab808947-8643-43e1-a01d-ad6537b9c08e/bibijidopanapekizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26acc201-dbbb-42fe-b450-6b5a86d039e2/nitefiliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb12ac02-d8b9-4007-9565-525c6e7bad34/alg_ynetimi_ve_maniplasyon_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8539446b-b63e-4ff3-874e-f11332ac26d6/wordscapes_level_8213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7385fd-fe08-41d2-a44c-6239895abdb3/21844776287.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_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 5072 bytes
SHA-256: a23a1f79a5eb5855680c9d1c776b814c22f1045dd902a947206e43716466c018
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 11732 bytes
SHA-256: fedb1c071f8b886622d0bd308ce28c1a4191e97e70d931515c188974b32c8855
font_02_sfnt_off000144b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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