Malicious PDF — malware analysis report

Static analysis result for SHA-256 817c6655ef185c89…

MALICIOUS

PDF

107.4 KB Created: 2021-04-08 06:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 01e5154192ebd693b7e14ba4736dc980 SHA-1: bc2ad68e9294c2a819b67ebd6f234a4f866447cf SHA-256: 817c6655ef185c8966cb73bba1ba50c41c52091429967fe1014c8064deed4f63
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://lozipotod.ru/123?utm_term=chota+bheem+tamil PDF link annotation
    • http://yognat.space/shield_charge_buildz4hik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487206/normal_60309268a7f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fece7dabc0bd.pdfIn PDF document text
    • http://hookup755.fun/samsung_galaxy_s3_through_straight_talkjnmqt.pdfIn PDF document text
    • http://prodson.space/dyson_dc16_animal_accessoriesd1yww.pdfIn PDF document text
    • http://pe50off.info/bututexofivijuvenolsg46v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5ff4d5222e73c.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/fundamentals_of_computer_operating_system.pdfIn PDF document text
    • http://feedbacrnz.space/sago_mini_friendsjf84n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_6019d1f5882c3.pdfIn PDF document text
    • http://mastericy-chistoty.ru/best_construction_project_management_books_ukam5nd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_601aef480cfd1.pdfIn PDF document text
    • http://reznitskygallery.com/study_skills_curriculum_for_college_studentsydrjo.pdfIn PDF document text
    • http://igcopyrightverify.com/volebutowawikupajeel5ve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_605a3f5ad4186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_601a7fd5dad9f.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/msc_zoology_practical_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_602194fe8d9f3.pdfIn PDF document text
    • http://tk-time.site/51858347582x8b8d.pdfIn PDF document text
    • http://5-euro.info/gugoluxogajofe0u5js.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_9e1d157f4ba847bbbaac47b825bf66c1.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_50ef474480224365b9c469e73d1ffa73.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 6568 bytes
SHA-256: 18f4960a52d64bc83d6c304eee4b25c9ca37eec54c0f4efd5701b5568bea1fd1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 13132 bytes
SHA-256: 83e7c98df619da4dbcde69a9e05d0e10c2cc4a6b9befb07b934b972212c15990
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 4696 bytes
SHA-256: c56ca62454c7d9ee994ac8098e432ebf29cebda435ed2a7b8620cdabb24c212b
font_03_sfnt_off0001357b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357B 8424 bytes
SHA-256: dc5e42809092282fab3876de67a80aaf0b5a70b80de92b82ae1bd1252980f934
font_04_sfnt_off00014d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1A 5028 bytes
SHA-256: c2a01d02c0cbf75667d2f4a62ff73b015aa83db9feeb3c66161dd83db49ba0af
font_05_sfnt_off0001601a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601A 11468 bytes
SHA-256: 91537ccd8d1d4db441563283b4e5f777cc2684ce68d4a1f9aee64024cfbdd09b
font_06_sfnt_off0001874d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1874D 16208 bytes
SHA-256: 844fb27054059bbe8e24107f7623dfc8b3714af0429cc888d8296577745ef093

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