Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9f2902a1e20278…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 02:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb9bf048e3221d67b6ae9787d65d16ef SHA-1: 1be20097a810a716e4131ec4c8d5e99d68cf68cc SHA-256: aa9f2902a1e20278ed9805de750cb1e7abe18a6f8e9dc61588448dea7458044f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=free+fire+fortnite+skins+generator PDF link annotation
    • http://zgic.ru/!upload/files/33339987422.pdfIn PDF document text
    • http://dentali.cz/files/files/ronaj.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/watub.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///bulusififekevipetur.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/3138945043.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090615054580554.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/96694412380.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/duzibimusovifefejatapuzu.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/37105951174.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/nelaxazowenemofujalo.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92809609268.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/49468223034.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/jigukuwisalaxisow.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/82196796854.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150419ee6d24---12950949364.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/53517187285.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/12473735999.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/20255792171.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/60209290007.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/25919159437.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zonedodubozetebak.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb70094b6---76227976350.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/89250874144.pdfIn PDF document text
    • http://btfa.tw/upload/files/soxolugerozaxepe.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/13071076250.pdfIn PDF document text
    • https://haidangpc.com/contents/files/72995286160.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210927_5D8F8788D3F93805.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://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_off0000bc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 17988 bytes
SHA-256: e1e59c71ab2b2abc1a5d9624d53dec29850708665abe07b4268ebef8cea32c9a
font_02_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 10412 bytes
SHA-256: 858c15113009cc9357c69599ef841c86ad6a43b6e398854391cd4da7c65de697