Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ac418e3fde518…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 22:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2577dc1cceb033aa2e083d88de90d376 SHA-1: 7cadfe6d742e0f353c63d449d732bf2fad660513 SHA-256: d23ac418e3fde5184cafb60433fd5946b642778586b3f42e27724b810766a2dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, suggests a lure related to educational exercises, which is a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=auxiliary+and+modal+verbs+exercises+pdf
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/631c07b4ce92dc2.pdf
    • https://gixobuwek.weebly.com/uploads/1/3/2/8/132815317/widajajon.pdf
    • http://tokexal.medianewsonline.com/tujarojifak.pdf
    • http://bapitafi.22web.org/witatupajujabupox.pdf
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/zimuxesuxaxak-babefegotono-bafobavefefa.pdf
    • http://bufizuz.22web.org/able2extract_professional_8._0_free_full_version.pdf
    • http://rimujitibux.mypressonline.com/platform_bed_plans.pdf
    • http://lesitegu.iblogger.org/minuet_boccherini_piano_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosevud/castlevania_netflix_imdb_parents_guide.pdf
    • http://zedoliwitimevaf.epizy.com/ronebugomujazasa.pdf
    • https://8de17e8c-b43d-4143-985d-773a0aa332b1.filesusr.com/ugd/01f6ad_d48db5155a384c69916a952dcf5a6888.pdf?index=true
    • https://s3.amazonaws.com/gotitibekovi/82212455331.pdf
    • https://s3.amazonaws.com/didowugorokirug/stretching_anatomy_arnold_g_nelson.pdf
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_4c5a74b3f6604a64b2ad4c0f4f328e15.pdf?index=true
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_63a313f27f3f4c38a20fe6e91f07121e.pdf?index=true
    • http://jenigaseze.epizy.com/5e_dex_barbarian_guide.pdf
    • https://2521c3e2-5736-45bb-9381-71005f2ffa37.filesusr.com/ugd/c85705_49200c9eba314e95bf80c17323b0d731.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_548200efcf2f4d559461b52c1b173492.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_b11e4a711f75491bb903bd00e0c37ca0.pdf?index=true
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_576db975e0f643f2acf034da8679f946.pdf?index=true
    • http://lerumedinopox.onlinewebshop.net/vapunened.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e016.bin
f2ce5aeec6af0feec848319cf7dc999b1c25ea02e2897d796e7be0dfc4874d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5660 bytes
font_01_sfnt_off0000f351.bin
d30f0fd13ffb2dd30c8ea9d14ed87565c04ced0e5f337f882a2bc35f518c0973		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 10560 bytes
font_02_sfnt_off00011798.bin
d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16060 bytes

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