Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1d651039700613…

MALICIOUS

PDF

81.2 KB Created: 2021-06-10 03:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9cc71cf5ba42f5cd655c9026fe45e05c SHA-1: 50eb69b829f315b387e86b5a9767725283a7386b SHA-256: cf1d65103970061325bd387bac5aada7e095a42e8db08fae55fbfa2c5cccb1b1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to a link farm on disposable hosting, suggests the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/123?utm_term=css+button+generator+software+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492246/normal_6062465771242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_60625903c31a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_6010d4293d00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5fd92b3039904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_604d7e7877aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_604e38e900305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481061/normal_60bbbb8683df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_6052577b18ea8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/30129911986.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/speaking_activities_esl_upper_intermediate.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/the_day_after_tomorrow_full_movie_free_download_in_hindi.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144446832/facebook_marketplace_ct_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a73837c-adfa-4182-b8e1-6cba65884b76/computational_fluid_dynamics_software_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d059a8-42a5-4ffc-8de6-f15806aa2d94/farming_simulator_15_xbox_360_mod_pack_dlc.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/zijuwoxanixolosibuwaruma.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/f/albert_camus_veba_zet.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/41787998606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028c56a8-c27f-4f42-87c8-c6bd9f8d0f3d/36389471285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715fa3d7-4137-42db-96a2-9fd99676cff0/visual_basic_2015.pdfIn PDF document text
    • http://tabemisakem.pbworks.com/w/file/fetch/145006887/harry_potter_the_three_hallows.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144520452/72710742414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833d201a-c3a3-4947-a4a9-541a6375caea/pagif.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/kipuvatewirakibuzididubut.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 5040 bytes
SHA-256: cc841f3fb70c773de8779454731ebec9d5b836e9821abafcbe57ad88f3e6c0c8
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 11616 bytes
SHA-256: 06d3b8dd083626499eb00206ee88d384435645ae467203ad6ac281ff48806469

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