Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f88c86332eac85f…

MALICIOUS

PDF

93.3 KB Created: 2021-03-17 19:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2e56d961ca832d50d40896ae728a4b51 SHA-1: 9b5d6fd01c963dfc8f98187bb3a92a7921a5089d SHA-256: 5f88c86332eac85f7cef515bea1175c61c57200140e28eb2b02c7d84f3e001e4
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 0.9976

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://xezojetit.ru/strik?utm_term=descargar+himno+al+maestro+boliviano+mp3 PDF link annotation
    • http://shoop-fm.ru/smith_s_hours_north_ogdenqenx7.pdfIn PDF document text
    • https://jujovokuzaxeg.weebly.com/uploads/1/3/4/8/134884411/2691577.pdfIn PDF document text
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/sonilexipujinejuna.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/9695255.pdfIn PDF document text
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/vurofezev.pdfIn PDF document text
    • http://chestlune.online/12396669156rp0wo.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/menekar_sogovefigezabe_zuguse_dabor.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/jofafewo_diruvumini.pdfIn PDF document text
    • https://voxukosobezut.weebly.com/uploads/1/3/4/8/134846839/dufeseluxut_judofimat.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/fakev.pdfIn PDF document text
    • http://munupesifak.22web.org/68114960668.pdfIn PDF document text
    • http://buloshnaya.site/31520721626lspay.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/ayurveda_vata_pitta_kapha.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
    • http://wuxekijonudi.epizy.com/limururavivul.pdfIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_a47651642dc34e588bc93f9f4ce78a10.pdf?index=trueIn PDF document text
    • http://torobedi.epizy.com/bullet_force_apk_obb_offline.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_b4e065021a5d46f182358d7dc3f3f5bf.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_35c6dd02df5249c49e1667c403d03361.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_3a2250e3a9ed4528aa3941ea394685fd.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_3f70916eb03b44e69da2c1cf3177558d.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_3dc98944af5442369283dc231eba7913.pdf?index=trueIn PDF document text
    • http://lexireto.epizy.com/best_free_article_spinner_software.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_b46d1e30190845f4ad06479467e18814.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 5500 bytes
SHA-256: 0103861e0c0e97967f86e4497fe3eae4ff20a001ee53e2c7f3a8ca2ef157090a
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 3596 bytes
SHA-256: 53194ddd84c3c107330ea3f95a64e265991c13ccacaa9dbf9d33c4b07892070e
font_03_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 12336 bytes
SHA-256: 92cf697615ba970c96f058458c0f4e9b3d45a081e65b4a69ddafbfee9d1f1572
font_04_sfnt_off00013f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 17004 bytes
SHA-256: 093d2437110ecad15b4e99fac7c21d463b28f6904ec041fafce99eac66c6b4f2
font_05_sfnt_off0001566b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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