Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3937d10462d9dfa…

MALICIOUS

PDF

167.8 KB Created: 2021-04-02 18:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: de4e258483ab94a3749fe5f21a10acb1 SHA-1: 62da786b60b1a920c44299b5d2f1d6700ac2fc47 SHA-256: f3937d10462d9dfac570e08cbfb3bef00f079696caaa18ae6146e047eac26aa1
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which are associated with link farms and potentially malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on untrusted hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=autocad+lt+2014+service+pack+1 PDF link annotation
    • http://potuduwatolebu.mywebcommunity.org/morningstar_stock_investor.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/tq8ojcu/78146309380.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/bronchiolite_chez_le_nouveau_n.pdfIn PDF document text
    • http://kinokaiff.space/regelusak7g0x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_6010ffe126da5.pdfIn PDF document text
    • http://copyright-securityx.com/esl_activity_worksheets_phonicsnt59d.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/data_warehouse_sql_server.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/activity_based_cost_management_an_executive_s_guide.pdfIn PDF document text
    • http://flash-sar.online/red_dragon_thomas_harris_quoteshlap2.pdfIn PDF document text
    • http://detonic-ordina.website/31177096380smfc7.pdfIn PDF document text
    • http://sparzha.club/vixotutow4gf2r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367959/normal_5fed702a892e0.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/lipaxujodebomete.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/rJkijaI/63586620494.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/35502718656.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/3gggi5b/max_payne_mobile_mod_apk_rexdl.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/bokexizometun/80433702139.pdfIn PDF document text
    • http://desejole.myartsonline.com/mirefamaligoteji.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/english_arabic_dictionary_for_windows_7.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 127324 bytes
SHA-256: af7e1bc657a4122df28d67f08b600e783b1f96f3906c7859e0b51f14cab5da88
font_01_sfnt_off000257a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257A2 5592 bytes
SHA-256: cb2bdf3d7f8204c7408ca4cffbba07b6fca0b04594600e05329d0722f9cb7cd5
font_02_sfnt_off00026acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26ACD 11096 bytes
SHA-256: e42421c5510b3da9d6e7f4e67e34925758de400609b54c1c411e7cc15765cb0c

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