Malicious PDF — malware analysis report

Static analysis result for SHA-256 e015b512c30eb21f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 09:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f6ee7fa40a235e818d5d2b3373402e2 SHA-1: db6451792def622d4e26050225c59a88c9888bbc SHA-256: e015b512c30eb21f7d30ff3c792a4d58e71519a38c914039361fcdc8f09fc7ca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains metadata related to 'business management pdf book' and 'wkhtmltopdf', likely a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=business+management+pdf+book
    • https://cdn.sqhk.co/rokijatu/jbhjgi9/cute_backgrounds_for_iphone_vsco.pdf
    • https://cdn.sqhk.co/wimiwupo/jhhaexc/30604379800.pdf
    • http://ziwigosopijulal.mygamesonline.org/sitepomeverogapis.pdf
    • http://kezijumedet.mypressonline.com/15097469840.pdf
    • http://rufoferapavinew.medianewsonline.com/cadbury_report_summary.pdf
    • https://cdn.sqhk.co/jedugifaxido/d7uidwR/kiki_s_delivery_service_english_dub_cast.pdf
    • https://cdn.sqhk.co/totarujined/igtfVcI/adobe_creative_cloud_desktop_app.pdf
    • http://gilumesu.mypressonline.com/fourier_transform.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_e5da5523b0294ec3b20117f29b3e0809.pdf?index=true
    • https://s3.amazonaws.com/xabalaru/pilumunimumedeme.pdf
    • https://s3.amazonaws.com/levovod/bhilwara_rajasthan_weather_report.pdf
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_fbd0278c6e4349419e3063b88054c3e0.pdf?index=true
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_dafab590b6ee46368c330c5ca2806f96.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_492106139a2e453d9383f05219bfe7ac.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_f6c0e532e8d94982a926314b591bb624.pdf?index=true
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_fc2b10ffdaea49eda41f6045883e9e37.pdf?index=true
    • https://s3.amazonaws.com/nigimul/advanced_english_proficiency_test_with_answers.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_7a211fbc40fb4c49b61e58cd227ccd01.pdf?index=true
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_21d3c0622869410d95e9b458da5042db.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed46.bin
04694addeff7a16a0a0037f6c9e5912cfb5de954462de7f964a69d2bdb1a3344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 5484 bytes
font_01_sfnt_off0000ffe8.bin
db08a357e23d1019312d47d64af33e28a2703f870ce99ae44d0ad17f041e7ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 11312 bytes

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