Malicious PDF — malware analysis report

Static analysis result for SHA-256 b886bc2fd8441adc…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 22:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d715463e73481620c0341bda24c5398c SHA-1: baf043c8ba657d36b0e54d9507d19354a9c0ec81 SHA-256: b886bc2fd8441adc435c830e7933c0826cfd2bc3c4ed9a3c5443223259234879
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple distinct PDF files hosted on various domains. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature strongly suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://polaryachts.com/res/wysiwyg/file/sinumajumebetisinixidumif.pdf In PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/83418521965.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eda57359dd---wigevikupidizuroxijetexal.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/gerawinenow.pdfIn PDF document text
    • https://goodline.by/userfiles/file/zisibe.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/gesinuwosom.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/31270015683.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/096c5c8bde7d5e6fd703f632614921ce/90186812305.pdfIn PDF document text
    • https://ms2oke.com/contents/files/83468482148.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vosazuradebefitag.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/tefevidim.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109260851508480.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/99535763527.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/gomezuzapasawamawarikaked.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/27349230352.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/102107_wujesusakimeriwojuboteje.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/geveragegasawudof.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/xitikuvinipagag.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/26928285201.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/26686633771.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/paluzesof.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/43786831157.pdfIn PDF document text
    • https://blogsma.com/files/zagaxusalixejukeliw.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/mafifukojulodojudum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+qr+code+not+workingPDF 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_off0000b023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 15688 bytes
SHA-256: 024e3e333f7f3540c0871320346c4ac90a17f265c078cc7e835612b54f5d95f4
font_02_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 10472 bytes
SHA-256: 87094253e64be64fe8c5879366cdd249113e0f1bfaaaa1dc4f675a593833f714