Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca827cb9ffbf1d64…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 21:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 22a83b4baa1efb413a1ac17261ad4b0b SHA-1: d50094e66ad0fadf3f586c9d010f052364ccfd2a SHA-256: ca827cb9ffbf1d645cae451ce43e8cd9f4d43edd15cde3fc56f62b648760ffcd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the embedded URLs suggest a redirection mechanism to potentially malicious content or further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=manual+cateye+strada+slim PDF link annotation
    • http://fasumaxupul.iblogger.org/maggie_a_girl_of_the_streets_summary_and_analysis.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/aisc_column_base_plate_design_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6044250f7a09d.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/autocad_2020_full_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5ff2e15dd5bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_6009b6dbbf549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ffa1471bb327.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/55ab8c04-cea8-45f9-8178-ebb5faa04d96/27561585734.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_d54a5ea5d37d49d19fabac108bf12efb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/519335b3-415a-4964-931b-7a695fe3c0b5/stock_market_live_news_in_telugu.pdfIn PDF document text
    • http://wilazetifoka.epizy.com/neverending_story_stranger_things_song_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914a8553-3b73-4fb3-91e1-8c10a491c836/fusalidada.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/formule_apertura_e_chiusura_lettera_inglese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc454ff-ca5f-4119-8eaf-d782412cd1cf/why_does_my_thermostat_say_system_wait.pdfIn PDF document text
    • http://todibosopif.epizy.com/politics_in_states_and_communities_15th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/84565752132.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_2452bbd45c2b46a191e2b264aa637117.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_7381fa010306498d9fc8574f8f2be5e1.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_c4279066f4694ab4a71f8c44b4c37b6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2627d3-0aa3-425e-b7d2-a41da8b17752/jufamisatolegefokodov.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 5192 bytes
SHA-256: c9ed929de9b697cca61d35526c850e65b84515f576127ab71c00c024ade983d0
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 2112 bytes
SHA-256: b9481e79e595cf5078010307db559e7b01275dc4d416de204654299c1a1059bf
font_02_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 11420 bytes
SHA-256: 0f6d9c17682f187c18751ce0712bb4bcef0e3cfc40ff000c1e4d1a248d59c8f2