Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca0cc4e232a53bb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 16:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9d3911b1ea37b43a8fb80f8b5fce1c8 SHA-1: 00f8965b14a182a74b647d8677bca47fdc71c577 SHA-256: 4ca0cc4e232a53bbd058fb980fe3b7e908f5e72ddd30fd5fbd714b09725bac63
66 Risk Score

Malware Insights

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

The sample is a PDF file flagged by a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially harmful content. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://taksis.lv/taksis/userfiles/file/36652965834.pdf In PDF document text
    • http://hocomesun.com/upload/zoveparajamelofijopi.pdfIn PDF document text
    • http://stl-hk.net/userfiles/rujixaxanas.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/62204613381.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/23177890328.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/15292645756.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ropekaf.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/61951515647.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/34401548949.pdfIn PDF document text
    • http://ijfbn.com/editor_up/bufaridatavifivik.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904035716.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/luwonetisusi.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/simopokowoxe.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/zibamuk.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/nopif.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/putugudixow.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/34525855679.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/44731422803.pdfIn PDF document text
    • https://viettrungson.com/media/Files/51043693273.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/49749686812.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/zalawo.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/11367417927.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lomutisikewane.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22301431037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+v+gta+sa+modPDF link annotation
    • 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_off0000bda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA4 16884 bytes
SHA-256: 2800e1d2866fe3cfd0d841c862b75b06fe887ec3e25e810c14e77edc8f9f3594
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10220 bytes
SHA-256: b3c466a2374cbdacdd205e20346dcad5995f9aab2c7ae0df2dc16203318c10c6
font_02_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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