Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81a7685cb36925b…

MALICIOUS

PDF

75.0 KB Created: 2021-05-01 17:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 040dc7db041bb55f0456b921b43def6e SHA-1: c188a4bb7a9741db7c82f842ec1b300294598960 SHA-256: a81a7685cb36925b8d5cd9b55e1a3686fbb1db2c18c7ae228191a3da28f8c359
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, indicates a lure related to educational content, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=similes+worksheet+for+grade+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5fe3b1dcc1ef0.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/hhfjhyd/san_andreas_city_gangster_crime_mod_apk.pdfIn PDF document text
    • http://6gusevshop.space/1168638740389jj7.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/55835569528.pdfIn PDF document text
    • http://help-bluebadgecenter.com/fofojiroxlgad9.pdfIn PDF document text
    • http://dsv-trening.ru/xbox_360_tray_wont_eject48fy6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372753/normal_5fdd22137a99b.pdfIn PDF document text
    • http://flowerport.shop/manual_fobt_kit5mmn6.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/jihpjhY/daily_lesson_plan_template_editable_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_602b94c40d75b.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/Agejcid/to_do_list_examples_excel_template_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_600d30105bf08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_a20bcaa113e44c4f9594860d32c85e22.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_fa4ab17e02784c0da1c359495a9a45dc.pdf?index=trueIn PDF document text
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_a2261178763a4305a6cd5adc35e8df2c.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_15ec359c1d6f434687e49647d44dc3e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/fiwukisupolixoneguwul.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/mibowisedevagagur.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/archer_hero_mod_apk_android_1.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/73320714742.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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 5660 bytes
SHA-256: bc13bd32bb2c693e01739fb3f91905ade294870b96d75324f7a27757d13065fb
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10764 bytes
SHA-256: a093b955553d499317ad4e1077aa15510b333dae9254d4020832d188509855de

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