Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f9becc176214a2…

MALICIOUS

PDF

86.7 KB Created: 2021-04-02 17:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e6cc77d9c763532b46cdad2ba2a6fae SHA-1: af3c5327455fbf8d87df2d592139824ceabe1397 SHA-256: b0f9becc176214a2d367fd67ccda529dc8bfbcfa0985bcafb4b932eea5ab341f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The primary URL, 'https://seumenha.ru/wix?keyword=download+apk+minecraft+pe+1.13', suggests a lure for downloading an APK, likely for malware distribution or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=download+apk+minecraft+pe+1.13
    • https://cdn-cms.f-static.net/uploads/4480756/normal_606046abddf1e.pdf
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5ff966e73bc8e.pdf
    • https://cdn-cms.f-static.net/uploads/4426966/normal_603965b8ee554.pdf
    • http://newipufisatag.scienceontheweb.net/sketchup_pro_2018_free_for_students.pdf
    • https://static.s123-cdn-static.com/uploads/4383568/normal_5fee0f35ce695.pdf
    • https://cdn-cms.f-static.net/uploads/4371261/normal_6058dbae8ad8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_943248ee893e4fea80251e15279c5605.pdf?index=true
    • http://pevogikuxupeja.onlinewebshop.net/was_it_all_a_dream_lyrics.pdf
    • https://s3.amazonaws.com/kegovev/bozerujawir.pdf
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_1eb44bf737eb4c29a209017f0ef2041a.pdf?index=true
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_2191d9b06a4141e28498cc3bdbcbe46a.pdf?index=true
    • http://lugivodunoxasi.atwebpages.com/99772077815.pdf
    • https://s3.amazonaws.com/xujitezu/thinking_skills_activities_worksheets.pdf
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_2eb0b915a6c347bbb3df8d51cec038c4.pdf?index=true
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_bc7609c02cd64c8c87aeff22e2302b87.pdf?index=true
    • http://kerexiref.onlinewebshop.net/pamudajubododujoneru.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_230fcdfaacd342169e5af171e521dcb2.pdf?index=true
    • https://s3.amazonaws.com/pubopelej/hungry_dragon_hack_apk_2019.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_94b230744f0043b9b3961f7dd97cccda.pdf?index=true
    • https://s3.amazonaws.com/titugome/92250851097.pdf
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_83ee3be436ea4538bb73a7d149fb70ae.pdf?index=true
    • https://s3.amazonaws.com/nilafafakem/foper.pdf
    • https://s3.amazonaws.com/kovibu/how_to_calibrate_a_torque_wrench_at_home.pdf
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_bc199235b51d4266870a99a05d20eba6.pdf?index=true
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_d8a8652b8c43489e92b1a866673be688.pdf?index=true
    • https://s3.amazonaws.com/wezukep/jirodo.pdf
    • https://s3.amazonaws.com/wewiro/75889651509.pdf
    • https://s3.amazonaws.com/polexebuj/latest_bike_games_for_pc_free.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff20.bin
e79562f199c334165ecf5953f0ee72222e3401cbeccb57a290e0de25580d99cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 5524 bytes
font_01_sfnt_off00011203.bin
a43d9a9e859f648c1e3cd3bc96053949d62f009da3bd58cff14ddf021a4372d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 10876 bytes
font_02_sfnt_off00013794.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16092 bytes

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