Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccea977ebdb8a3d…

MALICIOUS

PDF

123.2 KB Created: 2021-02-18 00:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d12c252851d6dd07da753b3758774470 SHA-1: df1610a4244301c7a2c519142b39e7093b011420 SHA-256: dccea977ebdb8a3d8d869adaf1cc5c999621562123f4042fe0882e3ab336f7cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=final+fantasy+7+remake+trailer+2018 PDF link annotation
    • http://storedubai.shop/86621313634effl6.pdfIn PDF document text
    • http://ledimpress.biz/chicken_invaders_2_online_freeywoma.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/nizojewa.pdfIn PDF document text
    • http://getbuiss.online/unit_1_dictionary_geometry_basics_worksheettjs2w.pdfIn PDF document text
    • https://tikekukitalil.weebly.com/uploads/1/3/2/7/132712015/remabilejawak.pdfIn PDF document text
    • http://kneeksi.ru/dipofezezelwh8ty.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/jixokoveledufa.pdfIn PDF document text
    • http://importants.space/691050873042wxxx.pdfIn PDF document text
    • http://masterpowerpoint.com/smallville_season_1_episode_1_dailymotionbdp3i.pdfIn PDF document text
    • http://zathkatow.xyz/basic_accounting_test_questions_answersvlzvo.pdfIn PDF document text
    • http://dvestideyli.xyz/sejagawupowidigogiwawacez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bifamomove/92241278424.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/free_tumult_hype_templates.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000167d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D9 11348 bytes
SHA-256: 781fda2d1fea17b72f532621e7189671c5ecf9afc127386743f8c88559b5f87a
font_01_sfnt_off00018d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D93 5632 bytes
SHA-256: 3d28c02809679049c1b73c13e2b0a246491f7b18f317e9607338776ff1ef8883
font_02_sfnt_off0001a0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0C1 11916 bytes
SHA-256: 4e14d6553a4a8da5124f3c88bff3f95b80796ff9b2924c5da92835c75e5e72d0
font_03_sfnt_off0001c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C923 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190

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