Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f96954abc9c6ff9…

MALICIOUS

PDF

85.7 KB Created: 2021-04-02 11:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d966095d1f4f411702703b26d299bc0e SHA-1: af4c0919a8d1428f646c1b192ccb947c94322aaa SHA-256: 6f96954abc9c6ff9698fefff373716f48a23b45e6ac2c10b1ee462c18236fa13
194 Risk Score

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. It uses an invoice-themed lure. 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 0.9995

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=balance+of+payment+pdf+download PDF link annotation
    • http://zurujavurobe.scienceontheweb.net/17476363251.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/contrarian_investment_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/MggrDsT/pepomixafogiwomasavuxos.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/dwFCouM/uc_browser_mini_old_version_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/idMhfcX/50837060419.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/9jcifhg/99955315949.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/trastornos_alimenticios_en_nios.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/hsvjgb4/81983607010.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/2177126674.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/bhgUggi/biscuit_cake_recipe_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/9iigc9i/angry_birds_pop_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/ihchajb/23157149539.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pufufatorum.epizy.com/formato_de_avaluo_infonavit.pdfIn PDF document text
    • http://furakazipekili.rf.gd/does_strength_training_require_weights.pdfIn PDF document text
    • http://jovozovoxisuno.epizy.com/45548619218.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/making_music_74_creative_strategies_for_electronic_music_producers.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_f8401bfac66f422782e32e74fcf3eceb.pdf?index=trueIn PDF document text
    • http://zimofizamar.epizy.com/capernwray_map.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_558e5ebc031a4def82971ea21b436fa7.pdf?index=trueIn PDF document text
    • http://luwemazezabubat.rf.gd/hill_manufacturing_msds_sheets.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_e083147f8ebf4cae8a0a309f338daa94.pdf?index=trueIn 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_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 2068 bytes
SHA-256: a3d7ba77d035e603caa6b033c9eb34ab0823edcbf53b52387eeebffa58cfa7fc
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 5268 bytes
SHA-256: 1321de601fff465bedf3ea472829edf0c03efe380d5305a45c5887edfc450c77
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 12092 bytes
SHA-256: 58808432eb1216baa6d5db794ddb6752682095d38a911eb73f70325191f5d835