Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a57bd333b96a8f5…

MALICIOUS

PDF

72.8 KB Created: 2021-06-13 05:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 202e5cc71985a17f2f5ca28efc58f062 SHA-1: e0214438bbcb374bb012483db67dd883d935a03d SHA-256: 8a57bd333b96a8f5a79aedc6effe7f9f200cbc48dcdccda0e984c29453a24522
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious websites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links, with one prominent URL being 'https://catamma.ru/pbw?utm_term=play+8+ball+pool+and+earn+money'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/pbw?utm_term=play+8+ball+pool+and+earn+money PDF link annotation
    • https://madudezogimune.weebly.com/uploads/1/3/4/3/134326665/4606722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_605b48c8b8f3f.pdfIn PDF document text
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/b8dc092e520ed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_60b7c2c8c1116.pdfIn PDF document text
    • https://nuzopilubejam.weebly.com/uploads/1/3/4/4/134459065/c0d1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_604e6cfae531d.pdfIn PDF document text
    • https://badukixekuxa.weebly.com/uploads/1/3/5/3/135388400/gugetozukasige-nemuwanemebu.pdfIn PDF document text
    • https://zasasefopuroke.weebly.com/uploads/1/3/4/6/134669399/dumumokagirazu_vegaw.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/tokovekokunisoxem.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/77ad0181-4695-447d-b63a-14de8e45e28a/71113949926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a106ee03-c58a-4c85-9474-8d592854744c/vonalusafutuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319fabe7-fba9-4001-b7e2-e53b6c70cdc4/bisalunofupelatalekag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a346297-92b3-4098-a59c-1aa91b76bc38/63811327563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6493cb-119d-424d-8cc4-b8d1e8b1726f/part_time_technology_jobs_austin_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f037dd-e57f-472f-8ca3-5cba77c03120/how_high_are_hurdles_for_12_year-olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2334d454-e87a-47a3-95b8-7ec92618594c/are_shark_robot_vacuums_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09c9b27-60cf-4b62-8bce-d5b9dcd6542a/xejelediketefopagesuzat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7904d3-2607-428f-8943-5d82386a98f7/a_midsummer_nights_dream_dreams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f601d40-d1b5-40c4-9c3c-0f1026f98767/weraseroduxajuvigafusuroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f99390d-4f1c-4e86-a927-19eb6bfeaed9/how_to_sync_a_microsoft_wireless_keyboard.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_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 5364 bytes
SHA-256: d7d02c2fc0e4a14cda6ee62f57f945a007996fdc742c803a2863454409304255
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10384 bytes
SHA-256: 1e28d1aea0ad47a3e7046d42d0089584ccf763757f87d0249f832cd9b09b9dab