Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff13d34ae2dae4f1…

MALICIOUS

PDF

79.4 KB Created: 2021-04-26 08:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 45767b20670c19c8aea4cf7885d98769 SHA-1: 7221ff85f390f5bda86e7603b13bcb8a97613af2 SHA-256: ff13d34ae2dae4f125d2fef05296f8e22bda20a2b3c065fe202d5a2e40fef309
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=what+can+i+make+with+an+air+fryer PDF link annotation
    • http://netekigupi.22web.org/tibesufexufom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5fc9330e38049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5fd7fb1115c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_604d4d628ec4a.pdfIn PDF document text
    • http://nuselobire.22web.org/ombre_lips_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5ff5bf185600b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_605a42d81bef9.pdfIn PDF document text
    • http://mevobul.22web.org/bluestone_alley_piano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujipopeb.rf.gd/burger_recipe_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75285a05-e17c-4104-afe2-eb13c02b68b9/what_are_the_different_types_of_drawing_instruments.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_4590007165004a878e1a6dd8d5c1963a.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_182079d256af44fdac3231f9c6d4237d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/317791d7-db46-4c74-b466-3467fa2928f3/3749809245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7f2449-c6be-47e3-b0c4-aa4b04b4fdda/buxevaxonivasivarafagupa.pdfIn PDF document text
    • http://xabasib.rf.gd/sapadalubatisixawosa.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_82482d04c8e54ce992b76c3e7aadb6d2.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_5aabaeacd5bb450db67633e00db679b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f48ac1-2d68-4acf-a507-4a00648a0b2a/trane_tracer_sc_user_guide.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_88454e1e5b0e4b9884d44729e7d9f173.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_94be267aabe649e6b79d0912868d3aca.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_359b9c1ca43e43d2bab49f9e58491cdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6600b6c2-d9cc-4c40-91c4-4ed79ada6499/69042376740.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ba53d0019ab94a9a81e769cef84e2b37.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_4b8de9ca2ebb4356b49dcb7513dc7c14.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_0a8bc8a1c426474eac33f0a208c3def1.pdf?index=trueIn PDF document text
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_e09ac2a8b1c84d2d9a8a37f66b496fff.pdf?index=trueIn PDF document text
    • https://0633afab-057d-4448-85e1-ac1a97571725.filesusr.com/ugd/66920c_5beea5b8bd5d4700b9f0c9341c5a10ae.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_b012d1c486f94c5fa79fd2edb7f32ce0.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 5180 bytes
SHA-256: 89751305383894f404b8b97eba1bc8cd9647d604e60c21c3e19cc0cda1ec76e9
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 11500 bytes
SHA-256: 1dca0bdc52400f1e355919a8cc24bd2b45f3e0d56ee5bc53d9fd571691b7d96f