Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91010629cf24a1d…

MALICIOUS

PDF

95.0 KB Created: 2021-03-12 11:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6714c5fa58716b79bca1012ef06e79a1 SHA-1: 30a803f9f19eefef14ffbcf01418c9a079aa9900 SHA-256: d91010629cf24a1dd267cac39707f2d719e2d418b730148f3cb57d2247214509
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, a common tactic for SEO manipulation or distributing further malware. The presence of external URIs and the overall structure suggest it's part of a larger campaign, potentially using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=cocoppa+apk+pure PDF link annotation
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/8609798.pdfIn PDF document text
    • http://yourdesk.website/fiwovinupanejovuvenijix6qqds.pdfIn PDF document text
    • http://vashmaster.info/how_to_write_an_experiment_report_sciencepgolk.pdfIn PDF document text
    • http://winoraama.site/dolalalunwh5m.pdfIn PDF document text
    • https://giridoxaxe.weebly.com/uploads/1/3/4/7/134703098/puwige_dilek.pdfIn PDF document text
    • http://gonzo-3d.com/38297604751nny40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_6a4404b0c33c4c73b8a54b1134913a1a.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_32fdada366784af49d64ffc47d92bfec.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_a5bca0d2ab1d42d99c6c832ea9ab4343.pdf?index=trueIn PDF document text
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_33e5d4acf88a4c4d896a2764839452dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakusineba/22034865321.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_df1c0c383bea4febb45ff03a76c31468.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_c34f43f613c945b487d2ee87c43608f8.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_d1251d1191134978b4e6ca42e9953701.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/avast_cleanup_premium_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/22531202473.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_2b74910bf482425d9911720c1ce021cd.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010b08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B08 8624 bytes
SHA-256: 92f7f63eefee8edbafd136292a72907baa10f2b83969733a75138ad31fd68935
font_00_sfnt_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 3160 bytes
SHA-256: 02b2ace715c44b9ad1e5e77f69d6af1cd793ec80f60689df95a138c8a2f4be78
font_02_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 4688 bytes
SHA-256: 132d53bb02b1d4a7de234431e8e41a8dbedf79e91e649dd0b752a489dabe753d
font_04_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 10912 bytes
SHA-256: 033c6c00413d1842cacbd80435b0ad24a24a8083b238af75aebd29ab10b661f2
font_05_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 21036 bytes
SHA-256: fd202c5d1656fdccb4d8682a3d4747c29ce4017f6f3207f7eb68530b8123ca48

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