Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da6b0f219e5af8…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 09:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bf9a39ed6a92de95ceb058d3819656ce SHA-1: 20c754f3a29f94a4a48c8387010d1ee24837a193 SHA-256: 26da6b0f219e5af83e03c2e223e47209f947f9a55cb07f4fe11b8605a678c41f
186 Risk Score

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 numerous external links, suggesting it is part of an SEO link farm or a phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's primary purpose is to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baarspo.ru/award?keyword=bossy+e+words+pdf PDF link annotation
    • https://cdn.sqhk.co/lareduke/jjhaX1h/2304667170.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/ribipezorakug-noxajopozexibo-zifova.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/radak-vawovukudo.pdfIn PDF document text
    • http://zazegafila.22web.org/how_to_create_a_business_plan_for_a_small_restaurant.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/dijopujapuxavirifeke.pdfIn PDF document text
    • http://flebolog24.com/seussical_jr_actors_script70vis.pdfIn PDF document text
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/7495078.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/6625726.pdfIn PDF document text
    • https://gokuveseloniku.weebly.com/uploads/1/3/5/3/135309313/lojevepibaj-dirubidogaz-bimutedowoz-jeteko.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/T6hdA8M/goal_goal_tips_approach.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/jKjdjdp/10327751105.pdfIn PDF document text
    • http://nagozubotejelaj.iblogger.org/which_statement_best_describes_non_probability_sampling.pdfIn PDF document text
    • https://zorutamazu.weebly.com/uploads/1/3/4/0/134096431/gasiva_keminamaru_xonaze.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/2232956.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/c4iemab/patijisubatadugu.pdfIn PDF document text
    • https://vujipobunovopo.weebly.com/uploads/1/3/5/3/135324227/8833927.pdfIn PDF document text
    • http://bet-info.ru/viwuseronomigozabonep0gg8.pdfIn PDF document text
    • http://good-production9.site/sunbeam_electric_blanket_controller_bl0400m5pu2.pdfIn PDF document text
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/niribilo-bujotexakane.pdfIn PDF document text
    • http://sadegobawuzufos.22web.org/nukewus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_03d4d5e4abc04a508980b5e765add68d.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_0f80a92af3d64f6ba4a27ecb46bbfd82.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_27fe83ee08484fd3b913d117319b3c2f.pdf?index=trueIn PDF document text
    • http://nejoluf.epizy.com/clasificacion_de_residuos_organicos.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_67b3ca8934b1484c8ba3a8cd23c8bb82.pdf?index=trueIn PDF document text
    • http://sakupoje.epizy.com/gewuroxusatuvufuzudulamaf.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_dfbca16b03f145ce8c0a84f6b2d82655.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 5036 bytes
SHA-256: 87518a1cf7d6817447c48e96631d89495bf46de6a3c83658c8b71f23663fa2bf
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 11320 bytes
SHA-256: df3d8def8c7df02fc7d8339c6ed5b940aabd56f5c495839c8658c5e6e0c4c74f

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