Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65c51d227046f5b…

MALICIOUS

PDF

78.8 KB Created: 2021-05-27 20:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abecfe9c59b875cee8b4d2cbe9a4913b SHA-1: e0821a0914b003d7aa8c1cd2daeff0514841f841 SHA-256: e65c51d227046f5bffe8a96a670216c5872a4a8f3f58af7554784904f6e62bd4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of numerous external links suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=los+escritores+de+la+libertad+libro+pdf+gratis
    • https://waxuxugiw.weebly.com/uploads/1/3/5/3/135312989/164b30.pdf
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/fanodupogeb-gebilinoros.pdf
    • https://nanopimage.weebly.com/uploads/1/3/1/3/131398258/jasuzi.pdf
    • https://vunabiripiboxuw.weebly.com/uploads/1/3/4/7/134756527/c61fbd0c4dd05.pdf
    • https://kebusivurokolu.weebly.com/uploads/1/3/5/3/135317059/4603058.pdf
    • https://static.s123-cdn-static.com/uploads/4454665/normal_6002c092c37fe.pdf
    • https://jedujubopo.weebly.com/uploads/1/3/4/5/134521244/4644235.pdf
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fe0ab30e392f.pdf
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5fddcddc402d2.pdf
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/16e20e3.pdf
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/pagikomufupaw_suxarevev_jaxam_xigup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e5a4292-3af8-46bf-a3c4-1a24fb2363da/hitachi_ac_review_mouthshut.pdf
    • https://uploads.strikinglycdn.com/files/72358ca5-a056-41f7-8ee5-4a20f4f701ee/womaromaxojanutexuro.pdf
    • https://uploads.strikinglycdn.com/files/2a1ac338-89a3-478b-9cd8-c3efaf8e5f9a/81557942591.pdf
    • https://uploads.strikinglycdn.com/files/0c24e3f0-4217-4686-b77d-2f55f9871ea7/jufisewuwezofigupowa.pdf
    • https://uploads.strikinglycdn.com/files/eeff7237-2c49-4539-a5c5-4abdfdcdd09f/vupigolaxa.pdf
    • https://uploads.strikinglycdn.com/files/d4f40793-4f82-46d1-9d0d-2c19bb142782/university_physics_13th_edition_solutions_slader.pdf
    • https://uploads.strikinglycdn.com/files/56c29a76-5cc4-4a8f-a5c8-2fe012a373b5/iso_9001_certification_course_in_bangalore.pdf
    • https://uploads.strikinglycdn.com/files/af393bdf-0e10-4416-83c8-d29978dc5ebd/40933386016.pdf
    • https://uploads.strikinglycdn.com/files/e0711847-249b-48f3-9776-fc8835c1211b/what_to_eat_thats_gluten_free_and_dairy_free.pdf
    • https://uploads.strikinglycdn.com/files/7ab3f3a3-9a2a-44df-88c0-a01644c1382f/you_can_negotiate_anything_download_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f293.bin
51bb407c2c552c130f298313a56c0318a6dfe986965093acf1e29d2e03b43473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5404 bytes
font_01_sfnt_off00010503.bin
e9c36e24ebe0645233d88200ef4bd902501e80a23d5559f51bdca6441df36a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 12396 bytes

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