Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf37f99767dff316…

MALICIOUS

PDF

65.1 KB Created: 2021-02-16 23:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3e0362ae3917ee570a7d7c6d905be14f SHA-1: 25b4d7669abe20501893c534ee49acec103dfa85 SHA-256: bf37f99767dff31649c55ea3209ae7068d130a882f67ee4428d77dbf98a9727c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=life+without+go+go+boots+metaphors PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365636/normal_5fce1756efd56.pdfIn PDF document text
    • http://nagonakog.22web.org/98133700649.pdfIn PDF document text
    • http://merogerofame.66ghz.com/jatovidu.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/raxowenumuju-ripekuzibi-kadufi.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/ribijugax_nevowanelatikiv_sigogonebelig_bojazaxabusovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5fd872778bff6.pdfIn PDF document text
    • https://levusukep.weebly.com/uploads/1/3/0/8/130814129/4090659.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/rimisafedelefusilupo.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/8364583.pdfIn PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/gakerano_xaneni_bobas_wifesovaziw.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/jepulamajojibari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_60084a611be56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budibebolimuxo.rf.gd/me_gozare_en_tu_presencia_jehova_letra_marcos_barrientos.pdfIn PDF document text
    • http://genufewewirim.rf.gd/93816290479.pdfIn PDF document text
    • http://sefatefa.epizy.com/duzifavasolakuwaxotuziwet.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/attila_total_war_dlc_free.pdfIn PDF document text
    • http://biwisuzasasare.rf.gd/docker_image_again.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE67 5456 bytes
SHA-256: 88b1aaa149128efdd7db00e2bae73a5b378708df09db5cca5746f06866136291
font_01_sfnt_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 11160 bytes
SHA-256: 6a1d032d96b9017df27c5e316b622a4300d9563551e68aa9c72a7cc22835aa17