Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e8669c328b1b33…

MALICIOUS

PDF

85.9 KB Created: 2021-10-06 20:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 05410707c9ce540ebe9a818eeb6e5c9a SHA-1: ebebe2fa3bc739837fe26838dbd40c8f31900a70 SHA-256: a6e8669c328b1b3378add7c54cdf96fa0a501a9d36f23e7ced9c3bec2191eab3
126 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 a large number of embedded URLs, many pointing to disposable domains, which is characteristic of phishing campaigns designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL distribution strongly indicate a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=select+is+not+null+sql PDF link annotation
    • http://studiogaleazzo.eu/userfiles/files/zuzijuburedununodiba.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/13636924323.pdfIn PDF document text
    • http://gewald.ru/content/Files/62350340680.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e343137db7---fowatozobogid.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dekugomedatizivab.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/gigojetokaxukizuwo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/gulixoxuwak.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/90767986355.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/90377662519.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210904200051.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/35567544305.pdfIn PDF document text
    • http://hkacca.com/userfiles/dasat.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rrevdldb3mjp2t48431ubujo28/49613298065.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/63879570340.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/94794442125.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/56007471729.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/16823605248.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vurimopevesaxofidipelal.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/mimusugovoruwefejipuf.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/guwififonaxuzonan.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/87429807368.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/76709292467.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/lusudedavidi.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/26321472610.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/nudejemutor.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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 19988 bytes
SHA-256: 84ba6ad813d0d8f4911d41f76db3da68232b3e0c553d1827ef02cd21c5558e28
font_01_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 10280 bytes
SHA-256: 88c6886f3585350d819b8ee03f500c57c8fc040c698bb46b72f12e44f4baf83e
font_02_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1