Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09236586fa4d0a2…

MALICIOUS

PDF

87.5 KB Created: 2021-05-21 13:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d18dee9b934cefaf71d3a3aac07432f3 SHA-1: 252f0efc2d2ca28a4ee43148996d2bf2585190d5 SHA-256: f09236586fa4d0a26bccd6984b40f1e229ca02f0db9e3886c8223000c8263808
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded document body text is heavily obfuscated and appears to be junk data, but the presence of external URIs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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.
  • 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://druttle.ru/strik?utm_term=dragon+ball+xenoverse+2+character+creator+online PDF link annotation
    • https://fesomexipilajuj.weebly.com/uploads/1/3/3/9/133997099/nepove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fcaebc186885.pdfIn PDF document text
    • https://tavebesu.weebly.com/uploads/1/3/1/3/131381332/nanagonoluz_vafimulapisolaw_xowovugatenatoz_mufomalogezare.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/kalojimajawami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_601b8acb2775c.pdfIn PDF document text
    • https://polivepuba.weebly.com/uploads/1/3/4/5/134582029/rulenajupiz.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/beduber-gifulesedasa-zinajaz-zudepimafufetod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e159de-6e4b-4779-b267-d428ffc83e09/space_exploration_merit_badge_pamphlet.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/99242758553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4418980e-201a-48b6-a27e-332d2da577c9/zotikaguneku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9beb2e-2cfc-4310-ba21-2f66f5586702/legabesesalotomixewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96f0e3e-ff16-4e9b-9227-8d06c244047f/campark_trail_hunting_game_camera_14mp_1080p_waterproof_t45.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092e7fad-9d27-44e2-af17-85042b387549/vetodebujowugudanovesez.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/wetaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc76ddf-4f58-4a97-943a-84c8d87bc7f6/free_acoustic_guitar_lessons_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/leneferirumexanusala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461e8a91-8b80-4877-9633-02c96b0ac2ab/13273913482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b11a850-589f-4d3b-9897-3042327ce51e/gezepilomuxovatafiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741d8ed6-ec02-44d0-b4d2-e686c39f031e/john_deere_316gr_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a54049-11f5-423f-af54-11ecbd4a0f16/wiwiwus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed6953c-66a1-4991-8fde-8dca3071eee4/pemudazegenov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf668ba1-be37-4e90-9544-c1ac9e22971b/does_blue_cross_blue_shield_cover_couples_counseling.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/67873147098.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 3124 bytes
SHA-256: 43a0f0e8310306b0d2bd43b3431039dd716d7d5d8e8bd1627163453c01ee3b92
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 5460 bytes
SHA-256: 35aee91246b0659ba04dfcae710e60b13c18407e72c83af6d41bb659ef38f4e4
font_02_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 10988 bytes
SHA-256: 51ebb84dac1e7ca3a61f85493223ba84f678e2f8adc2951f6ef6f9b22283bdc6
font_03_sfnt_off00013a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 16208 bytes
SHA-256: baa2c3c9ecba907a81f4e27a12959bde7f5a3bb7c6ba3b06b790f404250be079

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