Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bc89ae0a326564…

MALICIOUS

PDF

79.9 KB Created: 2021-06-09 22:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 212291baec56482840c99d4c40c3a28e SHA-1: d2c919e0b642a1bcba362cd4be2e71be20450e89 SHA-256: f4bc89ae0a326564ddd1339057e7a8dd1dafd7f1bb7cb312a83185956eec7d00
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 0.9993

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://coretry.ru/pbw?utm_term=the+dragonet+prophecy+read+online PDF link annotation
    • https://fovejurifeke.weebly.com/uploads/1/3/4/3/134342496/9f496bc075c.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/0f21c8b1cfa774.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/696d5297f75.pdfIn PDF document text
    • https://zobezuked.weebly.com/uploads/1/3/4/5/134502366/3906548.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/mudij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_6069f9351c618.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/xogotedagepab.pdfIn PDF document text
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/c9978bf63d919.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4415964/normal_60b40777cf58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_5fda5574666a8.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/dogoja.pdfIn PDF document text
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/biritenaliraxevitefu.pdfIn PDF document text
    • https://tunutepefa.weebly.com/uploads/1/3/1/4/131453603/c71c088b56918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_605d7fb856590.pdfIn PDF document text
    • https://dasiwijumajofep.weebly.com/uploads/1/3/0/7/130739595/jazijeza-vuxero-kazoba.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/e6c11a7bab6b.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/f2f48b991d91d0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144632793/kuxisutu.pdfIn PDF document text
    • http://xefobukeza.pbworks.com/w/file/fetch/144758142/biology_chapter_7_vocabulary_review_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb888469-1be0-4eb2-a44c-bddd48431091/sokesepupov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c3cb6f-79db-4a4e-806d-79e33423dcfc/romaniwetetej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320f45b8-1e98-4ecb-8a2d-66eb81328ab5/2013_dodge_durango_v6_towing_capacity.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/nescafe_dolce_gusto_manual_vs_automatic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96863b32-295a-4987-ba74-31c2b4aa3f9d/how_to_setup_nec_dt700_phone.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144415641/what_is_vrv_air_conditioning_system.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_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 5208 bytes
SHA-256: 3ca48afaf149e9c3428c301f79bd80c68ed23f00f70805291ce6a8e041d74fab
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 11120 bytes
SHA-256: 5dda4bd642fdc81c818013442278167495e909a1ea37e7b6825356ed1441e59f