Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb78f02d3d0cbf6d…

MALICIOUS

PDF

71.3 KB Created: 2021-06-08 03:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3bc79b594a25c15818197cdb74a74052 SHA-1: 3d5ad47d9922c193fd66f450432e8d1c0de9966b SHA-256: bb78f02d3d0cbf6d9a21ad92a3f06fe799ad1523dea4c6a9ff97e8d748768e81
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to a '12 week metabolic renewal meal plan pdf', suggesting a lure for phishing or malware distribution. The presence of external URIs, particularly the one pointing to 'catamma.ru', strongly suggests the document is designed to redirect users to a malicious site or download further payloads.

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://catamma.ru/pbw?utm_term=12+week+metabolic+renewal+meal+plan+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502698/normal_6007eab4bfcec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_602d0e5f20958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384320/normal_5fdcef06f08cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_5fdc25d677c61.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4493221/normal_60b4eee0a03e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_6008839084352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_60bd5e6680906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_602b7b3386ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_6037309d0c90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_605d65deabf8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_601b350dc63da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_6063f3c172f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_6044d57c61221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siruzosu.pbworks.com/f/silapepaxuj.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144677067/3369905979.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/present_tense_english_worksheets.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/which_of_the_following_is_example_of_direct_indirect_addressing_mode_cs501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a26f2b2-5553-4b77-98e5-c545914af821/46375575851.pdfIn PDF document text
    • http://bowawesup.pbworks.com/w/file/fetch/144639696/29824449143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f2c852-3616-43b0-b094-1a91ef4d4230/free_minecraft_windows_10_code_generator.pdfIn PDF document text
    • http://jutopar.pbworks.com/f/jeleketiwiz.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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 5508 bytes
SHA-256: a2f6653e0ef707e08d2312f806c86ef7ec079fa0a009b618510eb142ee8bff7d
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10188 bytes
SHA-256: cb311e6cfc995003a2d0151d1d9033969a980dc24bed55be29daa9c9865d43b4

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