Malicious PDF — malware analysis report

Static analysis result for SHA-256 388eec35ae59833e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-20 11:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 57ba7e6855483fa9c90edffd25b1d207 SHA-1: 594951242e81c7170b738cfced3a8ceffccf6fb5 SHA-256: 388eec35ae59833e6da82c9d9aba95e47eb072a7cbc24fe579ce1446a35565e7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=electric+pallet+truck+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368763/normal_60655eb1a3aa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fed8ed07a5c2.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/fejudikabolidax.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/4089b.pdfIn PDF document text
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/lituzivog.pdfIn PDF document text
    • https://damupese.weebly.com/uploads/1/3/4/4/134492451/dagivexumef.pdfIn PDF document text
    • https://jodawebodo.weebly.com/uploads/1/3/4/6/134634345/kewaraxuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_600a62533ba8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_604d1604ecae7.pdfIn PDF document text
    • https://zalefukonu.weebly.com/uploads/1/3/4/3/134346034/9185723.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/maxudiliparosid.pdfIn PDF document text
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/guposa-lifole-fijomo-vexuzupuxem.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/3157cda7-a039-49b1-9c71-e6bbb9a47101/pronome_relativo_ingles_exercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ce6a21-fc0a-4a77-98e5-4ed911139062/america_the_essential_learning_edition_second_edition_vol._volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad33560-3899-418d-9542-238f4b8c0baa/sentry_safe_open_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7a13ed-3ee1-4089-bb9a-6f681e71be0b/77170886127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea09174-be69-44d5-8366-b662277b8207/virikigotekikemirejopofuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68f63a9-912b-48b2-b14c-72fb3c02634f/serunefemototenedibesitiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8da29d-1e50-4039-ba50-958421a56ae9/wigozozaneserixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9355d761-0dfa-44ba-8416-aedf0f61fdb1/what_type_of_bread_can_you_eat_on_a_low_fodmap_diet.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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5100 bytes
SHA-256: 3a85db52d759ef7b2d7d0013d4b95c4c0aae72a3ecaa5b64148935855c559415
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 11320 bytes
SHA-256: b4c28e2762df8f2a62c2bdcfe0e25fb7fc0a0314750dde74002ffddeb5eaea15