Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d27f01ea282d70…

MALICIOUS

PDF

79.4 KB Created: 2021-03-12 07:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1c5ce9e5cdec27819131da7b74d6360f SHA-1: 770c9ab0f0ad1501ffe8f594b34fab6dd30f04fa SHA-256: d8d27f01ea282d70f5306017b8c30fb69a6ef9617495c7cc83522bde9e21f3e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to domains associated with link farms and disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=ping+pong+parachute+launcher PDF link annotation
    • http://itasda.online/958310521642ha5b.pdfIn PDF document text
    • http://onlyforyou.space/marvel_comics_free_download_in_hindicsxl1.pdfIn PDF document text
    • http://albatros-trans.ru/96294805106fqo86.pdfIn PDF document text
    • http://rollernefritmassage.xyz/889751582414wytc.pdfIn PDF document text
    • http://parralax.net/744460843151qvl6.pdfIn PDF document text
    • http://dfds.in/shakespeare_sonnets_love_18r28v0.pdfIn PDF document text
    • http://freehookup.xyz/shijou_saikyou_no_deshi_kenichi_ova7tok2.pdfIn PDF document text
    • https://sivavodafewe.weebly.com/uploads/1/3/4/4/134484486/jinisu-kovejebi-putusami.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/kala_patthar_movie_amitabh_bachchan.pdfIn PDF document text
    • http://copyright-supporthelp.com/92065767135t77p6.pdfIn PDF document text
    • https://wosabepowidax.weebly.com/uploads/1/3/0/8/130814575/botoditakaxo.pdfIn PDF document text
    • http://welojesuvarari.iblogger.org/what_foods_should_gerd_patients_avoid.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/43458922-3c99-4257-b6c8-fd4a7da26049/how_to_cite_online_news_articles_in_apa_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed0403f-2897-4774-b811-3b859d4ed730/vibuxojet.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/wuxelusolinebufe.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/afmc_exam_application_form_2019.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_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 5016 bytes
SHA-256: e6e2cbf8ac14ddf0acd7b1bec0e8cbd8916d400ef0125fd24610dd03979b0c18
font_01_sfnt_off00010de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 10264 bytes
SHA-256: 5bc7441f9dedb5f6e171ed50de58e2eeb349a6dc91540c37ed9bebde5454adbb

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