Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a7efd931121cc7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 07:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 989830d1e4ed6859aa40886263c90428 SHA-1: 9552357335bdbed567ab1ba102a01a80d09b290d SHA-256: 32a7efd931121cc79c9a96c816bc1bc32e8ae84fd95956d02d7adac2aeac2abb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://braus.uz/images/shared/file/66215534441.pdf In PDF document text
    • https://cfbadalona.net/ckdata/files/93549485146.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d106f06473b2bc344036b724acc6ac88/27619943420.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fegozisegoxodokaze.pdfIn PDF document text
    • http://12shio5.com/contents/files/16832704930.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/wubenamim.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911005150332319.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/maxaviwarisukuwonuzakor.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355c84273f7---15592998156.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210902011306.pdfIn PDF document text
    • http://esen.life/userfiles/file/susegite.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/30773665868.pdfIn PDF document text
    • http://strandedtattoo.com/file/77222637887.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/79469748212.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/bepufowadopakavo.pdfIn PDF document text
    • http://caythuocnam.org/images/files/wonimiperedizomajikofok.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/tawepalanuzidudixigi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/52106473364.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/72105913870.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210907163101234642.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/90050315540.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gozitazipakovuruwakuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lightroom+hack+apkPDF 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_off0000c29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 10420 bytes
SHA-256: b5426a800bded3184dbe46edff95aa4c928de71da079b1b6d02635cdf20d1936
font_01_sfnt_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 21248 bytes
SHA-256: 1e232b1cd9768cf93ac40f5fbf680a9c03e965e9869ecd706a7e9953f02ae22f
font_02_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1