Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d99244c916abd0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 02:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35d5d546905d9330543e9bbaf6c2f855 SHA-1: f3676b9702608817ded4d98e1a418b975255d8a0 SHA-256: 37d99244c916abd00ebed12f34ae9d68e7327dc3dcec2ef5f0453836884a4ac3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous disposable domains. The presence of multiple external URIs, including one pointing to a potentially malicious domain, suggests an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://geloracinta.com/contents/files/deziwige.pdf In PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/49797551581.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/xazalogojofewevejo.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/60844148379.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/43029975822.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/lubologumedusabawuzejolu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nopaz.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/62272878521.pdfIn PDF document text
    • https://menu2uplus.com/images/file/42454669450.pdfIn PDF document text
    • http://falerisztika.hu/tmp/9862751614.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/rowefotujerovazip.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/wupebop.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/japefabadoxiforuzonuseb.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15335773a---19160716561.pdfIn PDF document text
    • http://vhktn.at/images/content/files/73048877068.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/60948157405.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/raroti.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/86559363859.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/49978166137.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8981c408a---25078519441.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tizaketodib.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/gogugumudatuderusokirez.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wisubu.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/mikisuda.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/kakawo.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/96948415264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sat+exam+questions+and+answers+pdfPDF 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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 17396 bytes
SHA-256: e732ee8a742405bf473618582f330ec936bca07cfbfa0d2a3590df9f4c682f81
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 11120 bytes
SHA-256: 56da50d551a3f0f3cfd780c4aad1380df5a3ef978b1887290a7fe37cf9f094a8
font_02_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1