Malicious PDF — malware analysis report

Static analysis result for SHA-256 8523d6c7b8f8b4dd…

MALICIOUS

PDF

79.3 KB Created: 2021-04-06 05:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8c0e87098ba9686bff49daabdebac610 SHA-1: 557893155a339268e15a232af3e4cd8c5494aa13 SHA-256: 8523d6c7b8f8b4dda6bc9f3efacc97b8a03191109e7f1cd7c1e83dbdf6fd94c9
186 Risk Score

Malware Insights

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

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 6

  • 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 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://ponafet.ru/award?keyword=lauren+graham+talking+as+fast+as+i+can+pdf PDF link annotation
    • https://cdn.sqhk.co/jekuzedu/TgIRypK/5251424348.pdfIn PDF document text
    • https://cdn.sqhk.co/ganinidunop/PZieiaP/altiverb_plugin_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/axhejeu/94977381948.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/girjjxs/91104211194.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/jdhc1Fl/phage_display_antibody_library.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/gcvyl79/pixelmon_mod_addon_for_mcpe_1._12.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/albert_bandura_books.pdfIn PDF document text
    • https://cdn.sqhk.co/juvokapo/aIFC7d3/ronin_warriors_anime_planet.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/ibnsib2/xurabu.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/jbBYXgc/50880690022.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
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_33fe7f511bf94276a884dc7e18cc612b.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_fad2d0835c854a84a5c30a242e2d6c77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/convertible_debt_note_template.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/audacity_software_tutorial.pdfIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_967842c446944b59b0b9af016d34d35a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefodek/formal_asking_ideas.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_2147bd7e35cc41fc8c2a185b4941a564.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_7cbeb7015ef04042abd01784dca60fa5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/what_is_the_right_order_of_the_marvel_movies.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_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 5348 bytes
SHA-256: a50f699279a9b88e95161bf9280f28a939aa069f196ea8ffa66b82b8c779d185
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 11256 bytes
SHA-256: 5f8a8e04957af598c6d4b5c8060bd4d806dde2ce1d884cf000f8057d0bcefda8
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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