Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b086d282b93b899…

MALICIOUS

PDF

75.6 KB Created: 2021-03-08 20:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c4bca10a533faf1fdfcb34556e03a337 SHA-1: bbb788afe51b2df64c77be1a98b368b820d9ec10 SHA-256: 6b086d282b93b89927cd7b0fd0a9b522fa6c8987fa11f1e57855ad6350bf77cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. The document body, though heavily obfuscated, contains keywords related to a medical textbook, suggesting a lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/wix?keyword=washington+manual+of+medical+therapeutics+37th+edition+pdf PDF link annotation
    • https://bezuwodasufex.weebly.com/uploads/1/3/2/6/132696249/marutawetali.pdfIn PDF document text
    • https://zunovuxosuseso.weebly.com/uploads/1/3/4/4/134497136/1bdfcc9179f.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/what_is_the_average_amount_of_words_to_type_per_minute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5ffe7b322130d.pdfIn PDF document text
    • http://logawedulukudan.mywebcommunity.org/kibixitezolif.pdfIn PDF document text
    • https://zoxukumej.weebly.com/uploads/1/3/4/3/134327216/9368861.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/dokisitumokalojofapefun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_601980654f48f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_6bea95e736df44fea2bfb030b34bcc39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/oracle_general_ledger_reconciliation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/wipapobupukabis.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_4f3a99688c6a4ca6b016cfebe5163dd3.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/gevotomowav.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_c2afc79116664713b847e2e69e325516.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/63503246790.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/brush_lettering_words_practice_sheets.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_3c1f38947ff84a81bd5956a15e9864b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/xonajuzanimegosuminudalen.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_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5824 bytes
SHA-256: 0102c5e3b9da72cc41035e241ac63b02b713dc259d9010ca8a8be3f1c595861e
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 10472 bytes
SHA-256: cda447f89465f8e2de31b52bb1accce2c969b6a90de80265c9963032e22f5d6a

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