Malicious PDF — malware analysis report

Static analysis result for SHA-256 3425d76c38d14a69…

MALICIOUS

PDF

82.3 KB Created: 2021-03-22 00:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 517c1aa96c8097cc16da938358d1d736 SHA-1: 7ead9143f7d24fc4abdca81d3fca1ffb997bd26b SHA-256: 3425d76c38d14a695f0c18f41b2ac7647057485c6d87c6355aab8d61a7d132dc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as a phishing/malicious PDF by ClamAV and an ML classifier. The primary URL, zajinet.ru, is associated with a query about polygon exterior angles, suggesting a lure to a phishing or scam site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+is+the+sum+of+exterior+angles+of+a+polygon
    • http://help-nanny.site/61585888606b4xoq.pdf
    • http://sale20.site/devi_argala_stotram_teluguo23pw.pdf
    • https://cdn.sqhk.co/zurajekiviw/hNodXhi/49917177405.pdf
    • https://cdn.sqhk.co/sogefuluf/ghJqNge/30524932732.pdf
    • https://nigusejokolutat.weebly.com/uploads/1/3/4/6/134688827/tojerowureg.pdf
    • http://rm-swis-mine.com/53494452712hyzsp.pdf
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/gujonepodafarej_jujukali_jujigifapob.pdf
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/7535419.pdf
    • https://cdn.sqhk.co/nukuzulu/ciiMUn6/battleheart_legacy_battlemage_build.pdf
    • https://cdn.sqhk.co/rexukewanej/bVDEjfU/pivebuxawekemalonav.pdf
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/8a07551659fb5.pdf
    • http://gooddevice-online.com/evangelio_de_tomas56n2n.pdf
    • http://all-host.site/80871402414y0x71.pdf
    • https://cdn.sqhk.co/numevaju/hjAkasG/6715694500.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_4c0489344b7840eba88ecf95a86eb6fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/61e7fd1b-e985-480d-8438-80e716bc7512/82246702877.pdf
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_75e1c3cf80724f25988db4e9e19ed32b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37976726-c3fd-4e5a-b7a1-296e91188690/hp_probook_6570b.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_551dd8466f8c47d88b2b5ad81583a774.pdf?index=true
    • https://uploads.strikinglycdn.com/files/113594e4-3e4f-47dc-aa8e-2ff0ec8242d2/suzafukapafamol.pdf
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_c5ede39fc7b04cc28a898635062bc02b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5b4a1ea-3735-4f30-bc02-0f74573f1b15/someone_like_you.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5e.bin
e3318e840f685c5503e24cf354a4ca638b6892dbdadc820a17342beccec2d3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5496 bytes
font_01_sfnt_off00010104.bin
c34de17139645a2f50fe8b91a78ebad2c2f1508607d803edd8a04f05c35c1c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 10724 bytes
font_02_sfnt_off0001260d.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16096 bytes

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