Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aba25130371c81…

MALICIOUS

PDF

75.9 KB Created: 2021-02-27 21:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5643e693ac32745dab16232a08a3f753 SHA-1: 9d31f31a760bf6fe80bfee0d5bc6596b68420bc6 SHA-256: a6aba25130371c815a88615428a3edf41094ab6b4eb6c7ac3cd21d1279c6126e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming operation. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites.

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://dugedepap.ru/award?keyword=ucc-1+filing+a+lien PDF link annotation
    • http://gedadekenoz.mywebcommunity.org/72449199619.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/58fda7c94dd.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/Zigiib6/83891114130.pdfIn PDF document text
    • http://shopwithsale.website/petsafe_wireless_containment_system_rechargeable_collargtzvt.pdfIn PDF document text
    • http://haustova.com/mysejahtera_register_rm505mx18.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/Qx6sicM/axis_football_2018_mods.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fdbc9624607b.pdfIn PDF document text
    • http://arenaprobet.com/albatross_2011_full_movief4pan.pdfIn PDF document text
    • http://prognoz-football.club/il_est_probable_que_subjonctif_ou_ina7vo9.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/vugozumeda.pdfIn PDF document text
    • http://tophomework.space/sas_visual_data_mining_and_machine_learning_on_sas_viya_interactive_machine_learningrpxnn.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/eWEM2SV/general_knowledge_quiz_games_for_students.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/asus_sabertooth_990fx_r2_0_manuale_italiano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujidafedisezu.atwebpages.com/ramdev_yoga_book_in_hindi.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_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 4848 bytes
SHA-256: 0a4e22232d6db3f23034b177b60e27b1587c3a65ff3a164b490775aa9d11897b
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10184 bytes
SHA-256: 05113148b3e1aabcfbd10fa76f9da0820f0e46447c1f8c5dbabc0a084ca72017

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