Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee18cb1df4c4e57…

MALICIOUS

PDF

85.6 KB Created: 2021-03-23 23:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: de5af887dc895be4cbf0c94571bf709b SHA-1: b2450d6516c23fe94111a62fabe614cb03e907be SHA-256: cee18cb1df4c4e5762d1a95efdfb191020f19cb39023239b2d4d894a4b1b3a31
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unrelated or SEO-optimized content, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

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://druttle.ru/award?keyword=comparing+fractions+worksheets+grade+4+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488316/normal_600b773e6b7a5.pdfIn PDF document text
    • http://italy-small.space/38081892631mafz9.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/TExF0hd/hockey_goalie_iphone_wallpaper.pdfIn PDF document text
    • http://idclick.cash/lds_general_conference_october_2020_sunday_afternoon_sessionipduu.pdfIn PDF document text
    • https://cdn.sqhk.co/gugirejol/iJegeey/23749808652.pdfIn PDF document text
    • http://lolkek.xyz/what_is_ethics_in_health_educationg1nu9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5ff712e9c6012.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuwizatag/ge25Zhi/stickman_fight_battle_shadow_warriors.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/hjtghqL/tisidagunixoluzama.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://s3.amazonaws.com/kijelopazekune/bsc_agri_online_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/american_history_textbook_mcdougal.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/31610544158.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/how_to_start_a_legal_letter_to_a_client.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_66ac8c56fc3a48c892c8e64775fdede8.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_a958b64f364544589dfc60bea5da1c2a.pdf?index=trueIn PDF document text
    • http://mesozitimilupi.epizy.com/the_movie_business_book_4th_edition.pdfIn PDF document text
    • http://jijekoseme.epizy.com/74197628754.pdfIn PDF document text
    • http://tekobisami.rf.gd/printable_english_worksheets_for_kindergarten.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_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 5592 bytes
SHA-256: 7ec176848cef14205f4b78e092b76aaad5b90062582ef5dfe40c07ab829b308f
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 11308 bytes
SHA-256: a6e885d8419cbbf7c5370d23d30637ace5a79a10ed7e94cd00a2b10385bfb650
font_02_sfnt_off00013b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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