Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97eb6b3a1b28b81…

MALICIOUS

PDF

72.2 KB Created: 2021-04-24 22:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 761d1c0b4b81064bb01f0a5d8e69d0fb SHA-1: d3ccc2f87b50e100fa6c59e8d38480e3ba604e46 SHA-256: b97eb6b3a1b28b81d2fba2eb870cfff9d9d7f39aaf16aa0c5f6afcdc68333f78
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with at least one pointing to a suspicious domain ('dugedepap.ru') and others hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear user-facing text. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=heart+failure+drug+names PDF link annotation
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/kezuxu.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/xibibekilajorev.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/392403cf29.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/top_ten_addictive_android_games.pdfIn PDF document text
    • https://megigoxifiwovom.weebly.com/uploads/1/3/0/7/130740625/kumefudap.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/wghfMFG/car_mechanic_simulator_ps4_dlc_list.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/tgigctq/receita_de_glace_simples_com_manteiga.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/hDgqFgc/furniture_mod_for_minecraft_pc_1._7._10.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/ihgcqPz/xiniliraravuxabivovexan.pdfIn PDF document text
    • https://cdn.sqhk.co/fokapalo/ggGihMG/kalenagixipug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_c6191173c5cd42388ccd3d8ad93df9e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b392059-c8c3-42da-b87d-5305f9342a7b/2008_toyota_highlander_resale_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4951632d-6559-4f8c-9658-41bbe881495a/94472675900.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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 5188 bytes
SHA-256: b69dbf38dc66a479bc11a8ef6181397585fad8238994e6e91af140a4cff810ff
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 10196 bytes
SHA-256: 5ec56f578337f9c9ed427751048df514dbaf14cd05e73f87549e40b5466550f9

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