Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7938551f9675a9…

MALICIOUS

PDF

66.7 KB Created: 2021-02-15 22:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1d25907e0e2642597da0ad9055d99e9a SHA-1: e9dc8ab8a1157b9cff7bbc933fd67ebbf12b1dfe SHA-256: 5f7938551f9675a9094b9c6e1188d44e9e33740236dce229a8ec10e007cf5731
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

Heuristics 4

  • 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
  • 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://baarspo.ru/strik?utm_term=cost+volume+profit+analysis+example+pdf PDF link annotation
    • http://lefefegibilapo.22web.org/brothers_telugu_movie_free.pdfIn PDF document text
    • http://safilow.iblogger.org/ffxiv_botanist_leveling_guide.pdfIn PDF document text
    • http://nout-prodat.site/2017_chevy_malibu_premier_owners_manualh0fuc.pdfIn PDF document text
    • http://llloooodddd.space/hiv_and_aids_education_care_and_counselling_a_multicultural_approach0a82o.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/9651797.pdfIn PDF document text
    • http://austritkfa.com/andreas_lettenbichler_husqvarna_wr_3hrupu.pdfIn PDF document text
    • http://mists.space/wheels_on_the_bus_free_video2ecrc.pdfIn PDF document text
    • http://naturaleone.space/letter_format_for_absence_from_workyoarm.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/36b24cee7e31.pdfIn PDF document text
    • http://fallofelin.online/voice_changer_recorder_app_apknlp54.pdfIn PDF document text
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/jonut.pdfIn PDF document text
    • http://basiditdcf.space/25824909470qc5s1.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/284916.pdfIn PDF document text
    • http://sushibara.net/dorabudiwiletuzoxulubuzewsyyxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dusined/52651823555.pdfIn PDF document text
    • http://karatufi.epizy.com/davis_drug_guide_fifteenth_edition_apa_citation.pdfIn PDF document text
    • http://walogoke.epizy.com/powerpoint_2013_design_themes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/sample_email_requesting_information_about_a_product.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5324 bytes
SHA-256: b2f09b3e41aedd7508469a45bcc81fb2b1a42da3b1206e2a87899afb85c3fccf