Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c85f6f8212aa61…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 01:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7e213d3d6803c2f02350cae0aae70a25 SHA-1: b65b9e77914023647049e3dd102f12b79e7b4455 SHA-256: 11c85f6f8212aa61c26a040a5f2d1813ea53d4e2d9b07019954c4ee8e7125e70
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded external links, a common technique for SEO manipulation or directing users to phishing sites. The primary URL observed is https://leonvi.ru/strik?utm_term=magic+quadrant+business+intelligence, which appears to be part of a link farm. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=magic+quadrant+business+intelligence PDF link annotation
    • http://pogibofabut.getenjoyment.net/petrologi_batuan_metamorf.pdfIn PDF document text
    • https://davavenetu.weebly.com/uploads/1/3/4/5/134500413/xenunorinedegaz.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/zagaxalurerezad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_6028696f2be95.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/ielts_academic_reading_practice_test_2020_idp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5ff62194e2907.pdfIn PDF document text
    • https://tabofeluraratub.weebly.com/uploads/1/3/1/4/131438776/69ab7e5.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/building_technology_and_construction_management.pdfIn PDF document text
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/3215532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fdab43b8f7c3.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/zezofumevobukub_fogugubifad.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/ba3da88a-88eb-4fc9-988c-92ca5aa3860a/pofetepuzenabudegexenup.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/electro_dynamics_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e651b7-2be1-4325-a0da-4fab7dc9b207/error_missing_ilok_authorization_for_pro_tools_10_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9962ca85-7a84-4a3b-b6df-98e2afd085fe/php_mcq_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a52ab6c-7235-4e06-b0d9-a786672704f6/69708831789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23998abd-cebc-4ac7-91b5-3e354261b610/resuxowowuvufanifakaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a29a3ed-4f0c-4463-8911-192f830bb858/monakodubab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d223f8-d50d-4c51-af49-42e0d744529b/21257976952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717b46d5-baf3-42eb-b5f4-047814bc5b1a/barbie_doll_house_design_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5f165a-9688-4adb-a54d-61f8501cba19/kenmore_elite_dryer_clean_lint_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18482bcf-b63a-4db0-8c7d-848d70226dc0/tarapimefavitufog.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_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 5376 bytes
SHA-256: 5b649c25de59e9479f28ebfc9920d8db5c48e41a2b2733b8c12268e791a17d66
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10804 bytes
SHA-256: eaea971276753b96854607865893325d026966d39c19a42a07132f4c4a30c07f