Malicious PDF — malware analysis report

Static analysis result for SHA-256 4333793c82de9686…

MALICIOUS

PDF

70.7 KB Created: 2021-06-03 09:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5553cdc254bdbabbaa4902612eb02fec SHA-1: 382722a2881a0c9c4244b48797812631ebbc37f2 SHA-256: 4333793c82de968660e879125a74fd026b04e1298a96dc9c011858d3ab036add
124 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

Heuristics 4

  • 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
  • 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://pistant.ru/pbw?utm_term=davita+benefits+guide+2020
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/9768596.pdf
    • https://guwuribi.weebly.com/uploads/1/3/0/8/130873976/53635b7.pdf
    • https://tofitumo.weebly.com/uploads/1/3/4/7/134767961/nutenelevaro.pdf
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/fitalawijuwu.pdf
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/komokelitifelija.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_605ef9c292f05.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6025f0b60b469.pdf
    • https://cdn-cms.f-static.net/uploads/4394077/normal_603e4619f1a47.pdf
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/fizirevaba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d54231ca-4710-4e2f-aa4b-4e28a5e0ebd2/bugigawujuxebokotidulutof.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144425715/dolarofawimemazojavujodub.pdf
    • http://vifogajo.pbworks.com/f/how_to_play_chrome_dino.pdf
    • http://ziduzobif.pbworks.com/w/file/fetch/144454704/18785506525.pdf
    • http://tusoxefum.pbworks.com/f/eset_smart_security_premium_apk_cracked.pdf
    • https://uploads.strikinglycdn.com/files/e756bc02-63ce-4b2c-b5bb-40900f2b3a64/how_to_start_learning_r_language.pdf
    • http://pakesobiroge.pbworks.com/w/file/fetch/144552474/wordpress_change_default_wp-admin_url.pdf
    • https://uploads.strikinglycdn.com/files/e1441f56-9048-40c3-be32-9ceff315b824/cuaderno_de_trabajo_matemtica_5to_grado_educacin_primaria.pdf
    • https://uploads.strikinglycdn.com/files/d0533841-3493-437f-8071-8f8743c3250d/49923306920.pdf
    • https://uploads.strikinglycdn.com/files/25f69d9c-9c2a-42cb-a2cb-31326bfa7a34/lenovo_g550_touchpad_driver_windows_7_32_bit.pdf
    • http://gitefov.pbworks.com/f/12798046815.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f636.bin
25ff57e697174430d70b3fd6649e60a022195ca3e102f1be8e1877b3f8cde52e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 5192 bytes