Malicious PDF — malware analysis report

Static analysis result for SHA-256 94730c6ece3c2810…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 00:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37860a470c8ee16d05ecb8b3cdf4a6a2 SHA-1: b9fc1999761045cbbff1b88ffb57d864538d1788 SHA-256: 94730c6ece3c2810ee5d91c2e048c055a17c2b6fe5d52925a49f5e809c271035
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://mezovuduw.ru/wix?keyword=tutuapp+apk+android+descargar', suggests a lure related to downloading an Android application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=tutuapp+apk+android+descargar
    • https://static.s123-cdn-static.com/uploads/4488317/normal_5fc6f080d1a98.pdf
    • http://bulibujirifubof.scienceontheweb.net/vasisemirinelowonadamezu.pdf
    • https://cdn.sqhk.co/rotuzuwibi/Kiidiht/block_puzzle_jewel_legend_hack.pdf
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5fc7b2b0f12a2.pdf
    • https://cdn-cms.f-static.net/uploads/4373281/normal_604221f141388.pdf
    • http://talebakela.iblogger.org/limetown_facebook_episode_guide.pdf
    • https://cdn.sqhk.co/josipinu/kuGKSie/visoxudipelesimitiber.pdf
    • https://cdn-cms.f-static.net/uploads/4370307/normal_604154df1fb32.pdf
    • https://cdn.sqhk.co/pulununese/Gpiighe/lead_school_parent_app.pdf
    • http://pogekoxuw.mygamesonline.org/5039925527.pdf
    • https://cdn.sqhk.co/difixoruze/haieAQX/cara_daftar_mysejahtera_check_in.pdf
    • https://cdn.sqhk.co/kajutizikodu/Cidbyji/brimming_definition_example.pdf
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fcf4fd3b9248.pdf
    • http://diniguwoweka.iblogger.org/zarudexegeganoretofurim.pdf
    • https://cdn-cms.f-static.net/uploads/4381289/normal_602e42f90203e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lotibabakuj/kajos.pdf
    • http://lewinozed.atwebpages.com/illumination_calculation_formula.pdf
    • https://s3.amazonaws.com/jepavilutabilel/70336635731.pdf
    • http://jisukizopupez.rf.gd/ualberta_pharmacy_guide.pdf
    • http://vawinujofupin.myartsonline.com/ignou_assignment_form.pdf
    • https://s3.amazonaws.com/zafijukopa/vutovudalisumosera.pdf
    • https://s3.amazonaws.com/vavapekadoliti/2027866469.pdf
    • http://faxunarin.epizy.com/business_environment_book.pdf
    • https://s3.amazonaws.com/nagudo/action_words_worksheet_for_grade_2.pdf
    • http://gazunobopa.epizy.com/83592545877.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ea.bin
d356fc24ae55394d5ec417cda282fe76e17851e2f245662f7af2c8d4757b58a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 5224 bytes
font_01_sfnt_off000103bf.bin
04e4cfe33ebd3f3d7e63d4c8a200cb3e995757787b45d7b4e1df754dc3c71c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 11588 bytes

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