Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bb79f9a60e0962…

MALICIOUS

PDF

83.6 KB Created: 2021-01-01 22:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b1717d160d9c399e8782ddf7963b1684 SHA-1: 9b58db75d0e5f5f9b38cea88eebdf4d8a0bd4887 SHA-256: 08bb79f9a60e0962818a079a3fd29e56da55bdbf622d883d2a06dfa708c4ca02
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains an embedded URL pointing to 'trafffe.ru', which is likely part of a phishing or credential harvesting scheme. The document body, though heavily obfuscated, contains text related to 'guilty person noun synonym' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=guilty+person+noun+synonym PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fdc6f725af18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5fab5adcb33af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fea3202ba53c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5f9ca6f2d70e6.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/ifejigd/41015448872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5fdc2951bbbbb.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/xeropizuwe/74274714441.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/filamentous_bacteriophage_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00321e2e-57af-47b8-b4de-03f0b0c74aab/vumibikapuf.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/loft_jeans_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/simple_addition_worksheets_year_1.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/air_india_formed.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/boules_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/scion_tc_automatic_transmission.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 4888 bytes
SHA-256: 412bf59891bc74f2da0641c79d8b2b70c27558ab3437b393b1bec9a1201f7e70
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 4936 bytes
SHA-256: af58d431435010b75e3c7d1c655d720d6c33a139ed185eb4f48218c2d0e78a40
font_02_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 12412 bytes
SHA-256: f3aed664ed5a23debde28367fa6cd989d9dddef466924010697f048fd2000c67
font_03_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16344 bytes
SHA-256: 2e0ea7b848e2b9b22153e9097f9b09f260be7abe01a0e59c781b7c292f76223b

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