Malicious PDF — malware analysis report

Static analysis result for SHA-256 9007b9ea362d4d9a…

MALICIOUS

PDF

75.0 KB Created: 2021-04-06 20:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 41265da8b7eca791bb7a77cbb4712891 SHA-1: dac6d9d6132a405154121aeb028e00275682fbd4 SHA-256: 9007b9ea362d4d9a5507ee80a7258fdb385d58dfa95d37b84b7ac8e737d4e12c
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 0.9996

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://druttle.ru/123?utm_term=ordering+fractions+using+common+denominator+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fc7a13d5814e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_6052b0b8359dd.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/9219532.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/zamirejegi-tewixuviwika-dodewefidinofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fdebd239cc4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_60325902a0d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_6065e2161f101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_6069c49ea5583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_604cbad920e1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_5fe2f11a9756f.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/19cb9f00fa.pdfIn PDF document text
    • https://befofevaz.weebly.com/uploads/1/3/0/9/130969220/dadapitesataxuvugeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5fd958ccc15a8.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/an_introduction_to_abstract_mathematics_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_605b4a75a5ce8.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/557d6374-8be6-432e-bcd9-aa3596ebdb2d/how_to_create_a_website_with_wordpress.org.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dce900e-a273-4151-97c9-262f42027d54/macbeth_act_1_scene_2_quotes_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/xuvixeluvixumatazigo.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/62350897169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ee0fea-aaa5-4dc0-8d5f-0fedadd08bd8/how_much_is_two_denarii_worth_today.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/giwaxowamajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97861ec1-a2da-47ae-8539-12e100ef4477/effective_phrases_for_performance_appraisals_a_guide_to_successful_evaluations_ebook.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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 5584 bytes
SHA-256: 608739237b9fd4724994415a7a06d83e693ba8e1d1ebc55def817306bbeea6d4
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 10776 bytes
SHA-256: 00d18a8d420953306d9414ff69248198b16eb66815fdd87c64f8f19a0c9df448