Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f4f5a3393fdb66…

MALICIOUS

PDF

67.9 KB Created: 2021-04-04 20:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8cf6a8e1c65a1cf44308b8e787af4c74 SHA-1: cfb8a08465237de2e9113583b3edbd41e234943e SHA-256: b2f4f5a3393fdb669d3118e96e6125a2fb84de33546499b1652c9e1189b1a59a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://leonvi.ru/123?utm_term=cotton+dust+sheets+uk PDF link annotation
    • http://matawobedopikam.mywebcommunity.org/asvab_study_guide_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5fc9d9aeebf0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_603d0f00bb47b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5fd8f5ed36c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_6012e0f3ed8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_603729ee9a691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479917/normal_5ff4129784695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_602229387621f.pdfIn PDF document text
    • http://nuxipawuxodiwa.getenjoyment.net/68667073856.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/capital_list_of_all_countries.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8684190e-ecd1-463c-af1d-8cbad2b5aaa5/samsung_55_inch_4k_ultra_hd_smart_tv_un55mu6300f.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bcc7e5-cf74-46cc-b177-59c3bdf614f4/what_anachronism_occurs_in_act_3_of_julius_caesar.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/41779836933.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/zumowuxobanuwewap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca447e60-174e-4fa8-b74d-a0d080b5503c/sony_icf-c1_set_time.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/62247349760.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/sojetumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471384de-4685-4029-8bcf-d3a64c6e9e9d/how_to_make_formula_milk_for_newborn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b507e7-21a4-46e1-aa96-d8b689074e39/characters_in_all_the_bright_places.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/82913961952.pdfIn PDF document text
    • http://zuvovebedevavu.rf.gd/alphabet_russe_avec_prononciation.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_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 4544 bytes
SHA-256: 92c620f7c1b19991e52c22ab5560728ab7f967b2a05863e230217338bafc8cc2
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 10364 bytes
SHA-256: 02693ffca1aca12e96eb52b1d96a39776c32077697a7c3525ee964366dc7c38d

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