Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59353c84569c6f8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 02:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf021b4db820bbe6b5f1af7c3a73cfcc SHA-1: d4f8fd61679e1776e547737592f876687b6d1985 SHA-256: a59353c84569c6f8fbe414fce73bf0c378675aae1a44f7462bde688506f1bb42
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=converter+de+youtube+a+mp3+y+mp4 PDF link annotation
    • https://tommytest.dish1314.com/data/html_editor/files/dusotaluzofapa.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/30022955893.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/zugamoviwuviju.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mosojokurun.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/39852784937.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/fawabebesojiloketuwot.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muberoxezuwibiriribamef.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/bajugilubejovijepodejijix.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210905064824.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e1cb1f25---remotizivulojetifalamani.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/6675228916.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fizokabujowetixokuxuji.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/37462336539.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ce4edae---69878930052.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/20828786619.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/9897177450.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/kexufiwujexidovozol.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/rolavebisezugalarisuvapa.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/puwidegojax.pdfIn PDF document text
    • http://lamay.de/userfiles/file/tumojotoxexopekegijotak.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/57332086888.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/gofir.pdfIn PDF document text
    • http://www.celso.org/download/kulusirobuxu.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/xodusepu.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_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 18532 bytes
SHA-256: 49bf2dc9700b11660984493345079a8013f1fb63a19c7f49cea95976637c97a7
font_02_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 10948 bytes
SHA-256: 08358c9f364c54848f93dc0337f0a083fd49663fd2340e2c22954843f9aa109a