Malicious PDF — malware analysis report

Static analysis result for SHA-256 873cf77f126a4508…

MALICIOUS

PDF

88.1 KB Created: 2021-04-08 08:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 64796c6ca7f71b15880f5c07844195ae SHA-1: b1fac08c844a60063192eafd293087bff81e038e SHA-256: 873cf77f126a45086e99acd474e008d6b6c1ad8ba99a6fcb77e00616fa5f9a75
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, including one to 'leonvi.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to an essay, consistent with social engineering tactics.

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://leonvi.ru/wix?keyword=my+childhood+neighborhood+essay PDF link annotation
    • http://sizerasadaxer.mywebcommunity.org/dazelalafaxesukaziw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5ff907244395a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_6013b3318edc5.pdfIn PDF document text
    • http://tonagruz.ru/gigedovigusobosatop4l3dk.pdfIn PDF document text
    • http://islandlandscapesbb.com/sherlock_holmes_books_in_tamilswzh1.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/career_paths_cooking_teacher_s_guide.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/ballade_in_g_minor.pdfIn PDF document text
    • http://biolinkus.me/alto_sax_arpeggiosg8g6y.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/zurovejebo.pdfIn PDF document text
    • http://fedexonep.mypressonline.com/bhakti_yoga_libro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_605c6879933b3.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/KsdRhiR/real_time_heart_rate_monitor_app_apple_watch.pdfIn PDF document text
    • http://myimperfectmomlife.com/marketing_planner_template_exceld172l.pdfIn PDF document text
    • http://topplafond.xyz/95421135580zi850.pdfIn PDF document text
    • https://cdn.sqhk.co/vetejevibas/ets07vb/xidokageguje.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://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_9ae5b1554f9e4976899c4ab97a91f930.pdf?index=trueIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_ff013a88752f490da2293c022c42503a.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_c60d261ac5ba4d44bd174c4d413cf4be.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_7b43215c7e344de5b089fd401e2ba21f.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_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 5156 bytes
SHA-256: ce4d82e8bb1327d97148da1f14e870d83d9af0a39814e407a4ba3de113aa64b7
font_01_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 11588 bytes
SHA-256: 32493ca490dea2fad784c808fa50b6156a48d13534291529601e75791b89a1a4
font_02_sfnt_off0001431a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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