Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7eaea2e6b79ac4…

MALICIOUS

PDF

84.2 KB Created: 2021-03-29 20:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c547c89fce7dc4acbbeec6fdad434a SHA-1: 7a083d8ef413d602cfae7d5ef0834d3958eb23f4 SHA-256: 3b7eaea2e6b79ac497a4267fa6ddcf40abb1d5aa47d118326e88f917df4ae360
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests an attempt to direct users to malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-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://midufefew.ru/award?keyword=antimicrobial+therapy+and+stewardship+pdf
    • https://cdn.sqhk.co/jinuminex/caZigjh/avast_antivirus_software_for_windows_7.pdf
    • https://cdn-cms.f-static.net/uploads/4409610/normal_60391e8415320.pdf
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/a3a46f.pdf
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/xasera.pdf
    • https://wulakeda.weebly.com/uploads/1/3/4/5/134592464/nenozisuvila-wezem.pdf
    • https://cdn.sqhk.co/melipetoluf/amsTSgc/nunavagatagupokeranada.pdf
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/5372828.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_6024c46e96423.pdf
    • https://cdn.sqhk.co/fudamozomeb/ji0Mlz4/werugebonuroxuza.pdf
    • https://cdn-cms.f-static.net/uploads/4422150/normal_6033f9bed6253.pdf
    • https://cdn-cms.f-static.net/uploads/4420430/normal_604acd9298415.pdf
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/vaxav.pdf
    • https://cdn.sqhk.co/mumesimasozo/gjJjjjg/bubble_tea_places_near_metrotown.pdf
    • https://cdn.sqhk.co/zibusisujij/j7Kgghg/75617394546.pdf
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5ffccbf207234.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_c8a666a89be647d2af98baa19ff5ae05.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_e21d04584a94479b985196649ea53eb4.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_694ff8af93ed4925aafaf202ae41869c.pdf?index=true
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_5dcf5567f9384985bc805d9a292ed1b3.pdf?index=true
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_ec3a9b19250942d1b4ef181ffe211fd3.pdf?index=true
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_27cbe9a573054d0d8c6766d76f33c083.pdf?index=true
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_d955b2884962418492af51eda85d160e.pdf?index=true
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_c965644d0b444296a9c98c47d1be3ded.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa3f.bin
60982e6e71b2841e11c4d2998a882146c8e717d0e29e940a15b1211916f10558		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 5504 bytes
font_01_sfnt_off00010cc5.bin
fd2331e4e0b2fc241934935836e1ba54ce99e8c477b2e5ec82f1afa3a460f279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 11200 bytes
font_02_sfnt_off000132f9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 4324 bytes

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