Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf502d40301f2c29…

MALICIOUS

PDF

83.5 KB Created: 2021-05-18 16:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9dcd876c53415a3e20376d04ae4871f2 SHA-1: 9c76f0ec6a6d30b0a54cad7f60828d9bccc22957 SHA-256: cf502d40301f2c293384962cb800595715471f020c3142a7521207e7ae5a8b3d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://soxebez.ru/strik?utm_term=libro+gramatica+inglesa+completa+pdf PDF link annotation
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/mexupubiv-dubako.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/10181774699.pdfIn PDF document text
    • http://mutomew.22web.org/5655275776.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/sapidawo.pdfIn PDF document text
    • http://waxokuvinati.iblogger.org/76013113057.pdfIn PDF document text
    • https://rupuleda.weebly.com/uploads/1/3/6/0/136002844/zenotiwaluduwax.pdfIn PDF document text
    • http://tozufokoxogo.22web.org/3901264588.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/0afb28c0-6284-4b00-a662-f78ec5ed214e/petsafe_electric_fence_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae4e16f-4d1e-4075-bb0b-f7cdb80d54bc/807101876.pdfIn PDF document text
    • http://vevuxuwomeb.epizy.com/92554047832.pdfIn PDF document text
    • http://wanabovemuzume.rf.gd/pineapple_pen_apk_hack.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/nelugisoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3420c8a-7265-4a4c-a119-6168cae9a2f8/present_continuous_exercises_advanced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c90ab7-eb6b-47f9-853d-610776716a40/wineluf.pdfIn PDF document text
    • http://jojomuge.epizy.com/coplanar_waveguide_with_ground_impedance_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49163c6-6e6a-47f5-a3a8-aeb98bb522d4/hbr_guide_to_persuasive_presentations_hbr_guide_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e17eda-91ad-4bd1-9fb1-49683584dc8c/mr_coffee_iced_tea_maker_instructions_sweet_tea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4566c055-295d-4fc4-9b23-6108fbd4c6de/29099626161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f78f3db-1f9c-49cf-8388-de7777afcaf1/17628159828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8f2531-c714-4e94-ada7-e3d694548812/quinny_buzz_stroller_instructions.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_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 5556 bytes
SHA-256: 21132df5c0b1650d296dc9aa8d62fb8fdc13d70da4c774cc96352099472be2fa
font_01_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 12212 bytes
SHA-256: 6b99ebfa2282586e18b9ecbce439641d675dbde2fc9051ecf0a6d3c6fc7f706e

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