Malicious PDF — malware analysis report

Static analysis result for SHA-256 52667e887a377ae7…

MALICIOUS

PDF

77.4 KB Created: 2021-04-05 10:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4345136cb692573079b72ff4846a3102 SHA-1: 3c7e77816d1a1a441b80f0c3c0399f8600042d0a SHA-256: 52667e887a377ae72e27ef178010f960032d2041b07d823ad833e302863af50c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to invitations, likely a lure.

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://jottigo.ru/123?utm_term=bridal+shower+invitation+template+psd PDF link annotation
    • http://leopolds.space/gusureraviligaganatobewu9q15o.pdfIn PDF document text
    • http://starkrobotics.org/444936358913ppi0.pdfIn PDF document text
    • http://complect-tech.ru/logic_puzzles_puzzle_baron_answerss2jje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_601dcc31efddb.pdfIn PDF document text
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/lexatar.pdfIn PDF document text
    • http://starconflict-game.ru/xejuforukalimojunibij2xvyg.pdfIn PDF document text
    • http://kinokaiff.space/ferivilunabbq1.pdfIn PDF document text
    • http://copyrighthelp.info/21519988912e6adf.pdfIn PDF document text
    • https://bodujifoji.weebly.com/uploads/1/3/5/3/135394102/8401b90cebd63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_600e0b4b09a6c.pdfIn PDF document text
    • http://artyom.guru/driver_acpi_ven_hpq05ktm.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/fufuvixoxegurazebuf.pdfIn PDF document text
    • http://xazowagef.mypressonline.com/interview_questions_for_quality_assurance_engineer_with_answers.pdfIn PDF document text
    • http://keksik24.ru/apprendre_anglais_facile_pour_debutant26oo6.pdfIn PDF document text
    • http://jushq.club/credit_report_dispute_transunionicsc0.pdfIn PDF document text
    • http://tuvoreda.scienceontheweb.net/mark_twain_huckleberry_finn.pdfIn PDF document text
    • http://swast-group.website/blacksmithing_guide_classicbpjh7.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/autocad_3d_modeling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somifisuvukibuk.onlinewebshop.net/bewidukafuzivunubuvib.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/10387636719.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_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5400 bytes
SHA-256: f5b02a18cc975abc05d8c832219044932183da78eade733741d2e1bb829a3022
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 10460 bytes
SHA-256: 39b95c40fd2d1dc2ec05f0ba890b010e2bf140651614af36523fd7ebe1009645

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