Malicious PDF — malware analysis report

Static analysis result for SHA-256 736c779fbc3d3c65…

MALICIOUS

PDF

80.0 KB Created: 2021-03-29 00:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b0872053548d6790e8f975d9a6d930d SHA-1: 54cd81b3e27c0dc7b1cbd91e3dfb39150f99d801 SHA-256: 736c779fbc3d3c658383c471224847f0c98ef9012a3cbf59b2a0d4f2814256c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=lipid+oxidation+mechanism+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fee734f1c10b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_602e2e412f1b6.pdfIn PDF document text
    • http://widarexidifazi.iblogger.org/placental_bed_disorders.pdfIn PDF document text
    • http://xozonline.ru/fupikovujarenoluguy5e4j.pdfIn PDF document text
    • http://semengergel.ru/a_counterfeit_question_is_one_that_blankvj97r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_602e9f397831c.pdfIn PDF document text
    • http://vuxijagodoku.22web.org/dejunojoramexuretu.pdfIn PDF document text
    • http://basisemakus.iblogger.org/audacity_2._1_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_603dd40353271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopamur.rf.gd/63927908770.pdfIn PDF document text
    • http://jagazuzigi.epizy.com/dukanopojomenosodorijex.pdfIn PDF document text
    • http://jopodovijub.rf.gd/nasabadebatefalatawunaw.pdfIn PDF document text
    • http://kakofuwogo.epizy.com/autocad_2020_training_manual_free_download.pdfIn PDF document text
    • http://dosatetirudipu.epizy.com/zugebumixeriled.pdfIn PDF document text
    • http://zagafelegaxo.epizy.com/43614197173.pdfIn PDF document text
    • http://sonisan.epizy.com/82687218543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e8f29d-0af8-432e-b262-7e460dd7f816/5_steps_to_heal_leaky_gut_dr_axe.pdfIn PDF document text
    • http://sufuturafo.epizy.com/82770855250.pdfIn PDF document text
    • http://vukekabexipog.rf.gd/2020_gmc_acadia_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbcab24-6b0c-4e93-a292-d4c1675edbb2/jazurijuvovijuvelom.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_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 5276 bytes
SHA-256: d4edaa41c579aba6f8b803d8dd552d71f606a426349216658ce3300905404176
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10516 bytes
SHA-256: 0a4d6cda4bde588e07ad538b1d88b4e11cf6a2d9d5dfa5cd92befc2ca7b51bd0

Open this report in the interactive analyzer, or submit your own file for analysis.