Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d67c2b65e275cc…

MALICIOUS

PDF

74.8 KB Created: 2021-02-11 18:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 99ed8e5cea12506b6e54c3841f106647 SHA-1: 2d98297d93642c22cd5271f43bad892f07209dfa SHA-256: 20d67c2b65e275ccc208bbf5b915fd8758741bab9607898103f21bc9a2900827
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet', aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wb?keyword=unreal%20conditional%20worksheet PDF link annotation
    • http://umdtheatre.ru/find_area_and_perimeter_of_rectangle_worksheet48oy8.pdfIn PDF document text
    • https://cdn.sqhk.co/juzexokogim/hfjgjjH/xawinasutofukidumuterera.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/fhfhhaN/laxoruvem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5ffb6d6f125cf.pdfIn PDF document text
    • https://wusoditada.weebly.com/uploads/1/3/1/4/131406121/lesatot-dapilofusotonuw-wigupidesuti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_60007a8248a51.pdfIn PDF document text
    • http://mugedly.xyz/android_version_names_2019md8r8.pdfIn PDF document text
    • http://netewe5.xyz/blouse_neck_models_photosq563y.pdfIn PDF document text
    • http://blaugrana.ru/zosibubupivakimanolj4fwh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zonadomafi.rf.gd/fusionner_plusieurs_fichiers_avec_foxit_reader.pdfIn PDF document text
    • http://derajovaku.rf.gd/blank_calendar_template_october_and_november_2018.pdfIn PDF document text
    • http://doguzikeva.epizy.com/tujavu.pdfIn PDF document text
    • http://pifutujotot.epizy.com/humanoid_4d_cards_free.pdfIn PDF document text
    • http://suludigana.epizy.com/bahubali_2_songs_telugu_pagalworld._com.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 4960 bytes
SHA-256: bdd8c6a3314ff0418efe023a539f8f20cd4be84d012186cc8ad1ea9cfd558c77
font_01_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 10780 bytes
SHA-256: d362d2cae8cb650babe338abeca0445f12ae5968ef5f95ce47f4d04e732ceb7e
font_02_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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