Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df98c261d1a6cab…

MALICIOUS

PDF

77.5 KB Created: 2021-06-08 09:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 810146e33a4d836fa91431a250f34d1a SHA-1: 254ef12add9deb63b41842de0773e9c86028d97d SHA-256: 4df98c261d1a6caba89f35d7ed660586f84001d3353bd0da6db3e3fb519b8305
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=kathi+mela+kathi+song+in+isaimini PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4497358/normal_60b132b4683a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fe34cea3ebbb.pdfIn PDF document text
    • https://zeburunonuf.weebly.com/uploads/1/3/4/4/134458398/3086024.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/matawa-tonavetumot-wegujafegaliva.pdfIn PDF document text
    • https://jufujepil.weebly.com/uploads/1/3/4/6/134650130/mudemobuniru-jajumojex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410190/normal_5ff20565e097b.pdfIn PDF document text
    • https://vafobuzegigotot.weebly.com/uploads/1/3/0/7/130775214/b2db854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/gazexijulazedaxobebakipol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e53af2-4258-40f7-bdf3-3c62c3a026e2/how_to_charge_i7s_tws_airpods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912d1032-70ac-43f5-b84b-18515467e4af/33180343847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4868ad06-54eb-497d-aba9-79896e2da389/funlux_camera_reviews.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144655725/29097114758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc6e8f0-af4f-4bec-a855-3d1f177ace3e/geresofajijamozolitotute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1464c7e3-f11e-4387-b0bd-f794b397598d/cdigo_internacional_de_nomenclatura_zoolgica.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/15614458775.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/w/file/fetch/144634503/does_zappos_take_back_worn_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83383d6-eff8-461d-b1d8-59677d90e188/html_tutorial_for_beginners_in_hindi_part_2007.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/vodoxuvusuputunusevoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38f2aaf-64eb-4ed1-be93-18f468fb6b46/gewed.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144500508/bavizaxurokupipe.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/what_is_the_best_free_anatomy_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 5036 bytes
SHA-256: 742e33aa3d10942cac385639c7bf9bed97644940189da4cce102aefba23b008d
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 10308 bytes
SHA-256: db057892e99d5e2c407e3be128b8fa060fb0c7c656c6773c646754564c2ef104
font_02_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 18776 bytes
SHA-256: 1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6