Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdd7b0ee89be63f…

MALICIOUS

PDF

63.4 KB Created: 2021-02-19 08:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3243bae8d158ae347661ab3477890e29 SHA-1: 635b2163544f03e3d26cf5720f3843effb8a5c46 SHA-256: 9cdd7b0ee89be63fc1989f358a1d46bf52ce3f45d4c52780a23f3951a84205fa
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'Dostoevsky demons sparknotes' and the wkhtmltopdf application, likely serving as a lure. The presence of external URIs and the link farm heuristic strongly indicate a phishing or redirection attack.

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 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://maypoin.ru/aws?utm_term=dostoevsky+demons+sparknotes PDF link annotation
    • https://cdn.sqhk.co/wifinalimow/ibNiegg/craigslist_seattle_pets_for_sale_by_owner.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/dgd1IaP/spinosaurus_2020_tail.pdfIn PDF document text
    • http://ripefaw.iblogger.org/19382788780.pdfIn PDF document text
    • http://fdvsefwfrw.space/emotions_vocabulary_sheethom0d.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/leatherface_1974_maskgu14c.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/gi4jbRX/bbr_tuning_motorized_bike_jackshaft_kit.pdfIn PDF document text
    • http://xugafigipi.22web.org/5771054750.pdfIn PDF document text
    • http://bekowakiged.iblogger.org/thank_you_so_much_for_your_answer.pdfIn PDF document text
    • http://zdsshop.top/jubaxojodajananojamezure8l3iw.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/4696545.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/5rtpGIY/formula_1_2018_game_download.pdfIn PDF document text
    • http://kemotunitajifap.iblogger.org/xajekabimanemumodize.pdfIn PDF document text
    • http://wubewaxipezopi.22web.org/balistica_unam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://relotetuje.rf.gd/android_studio_affected_modules_app.pdfIn PDF document text
    • http://datonojafasaxup.rf.gd/twist_song_wapking.pdfIn PDF document text
    • http://kutezowifemiwe.epizy.com/rational_expressions_worksheet_2_simplifying_answers.pdfIn PDF document text
    • http://dulubuli.rf.gd/70706850600.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_off0000bea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA7 5296 bytes
SHA-256: b69083daba0fd45fa580462d5f1e60e865945bef65a1dc2aacde7979b214c565
font_01_sfnt_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 9408 bytes
SHA-256: efc72518adb90055782082bc52e6626fded7a0459f55ccd34cfa29d8ef72bfa5

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