Malicious PDF — malware analysis report

Static analysis result for SHA-256 52086260cd5fddaf…

MALICIOUS

PDF

82.6 KB Created: 2021-03-27 11:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8a0d3c4b23dd4d8c476f90e674735872 SHA-1: 51ba0089e682668540a3453fcb560efa9a81a301 SHA-256: 52086260cd5fddaf408ff8b8a954f8a086c2469b5d6da072490aae0cb9758544
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://midufefew.ru/123?utm_term=android+studio+project+root+directory PDF link annotation
    • https://cdn.sqhk.co/gedugari/U7WkVhg/nugofaxu.pdfIn PDF document text
    • http://kismykeitio.best/samsung_nx300_firmware_update_downloadfm33t.pdfIn PDF document text
    • http://sberin.xyz/3913370082ugqmx.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/AhaqjhE/child_education_allowance_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_605c14af3aea2.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/58763443581.pdfIn PDF document text
    • http://kapusta.pro/32922824424xl98e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_6007d74fc85b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_60170b36cd7a0.pdfIn PDF document text
    • https://cdn.sqhk.co/numobelez/gjDhbIM/abcd_2_movie_hd_pagalworld._com.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fe65f0e7b2c4.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/hehfWYB/touchdown_game_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_6034433b2c3fc.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/exercise_on_subject_verb_agreement_for_class_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/button_mushroom_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/69269323731.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/67565120817.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_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 4992 bytes
SHA-256: ab9f68f4336ebbe6ae97ded2ee965831448058f281dbe19f45136473c09d71d1
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 10920 bytes
SHA-256: d9bdeb1c93e15665b7d0557d5cee5959c0166a19afd45a480476673ce8e4c892

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