Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52107589b65765e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-11 20:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f36f7ac6bbb175fecafbd38cfa5ffaf SHA-1: e677eebc464da25a256e3321eba77b4a612bb965 SHA-256: f52107589b65765ee543504c413d771376b575ea16ee72602e3f792094050290
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://botokaw.ru/wix?keyword=mu+sigma+upsilon+greek+letters', which is likely the primary lure. The document body is heavily obfuscated, but the presence of the malicious URL and the detection signatures strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://botokaw.ru/wix?keyword=mu+sigma+upsilon+greek+letters
    • https://static.s123-cdn-static.com/uploads/4369633/normal_5fddfeaabc22f.pdf
    • http://fuvisetitisenon.mypressonline.com/flow_shear_stress_equation.pdf
    • http://mujubow.getenjoyment.net/wewezev.pdf
    • http://xawamiwupajev.mygamesonline.org/sezikebefezim.pdf
    • https://cdn-cms.f-static.net/uploads/4465257/normal_603e7b6117e81.pdf
    • http://jilavixit.medianewsonline.com/26725344143.pdf
    • http://dafagaketa.sportsontheweb.net/jaraxikoravasagizagi.pdf
    • https://static.s123-cdn-static.com/uploads/4370275/normal_5fe4f5211235c.pdf
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd26dd10dc69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xabudavadeguvo.myartsonline.com/xetavokubokebezubesa.pdf
    • http://wudazebej.atwebpages.com/23389688103.pdf
    • http://kubowulurarekij.myartsonline.com/how_much_does_a_new_bobcat_cost.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_29cea0f4ad654f748aba6d2a55b43068.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ab82dba-bff4-4a65-b708-b4109d144758/wisufagidekelabomadok.pdf
    • https://uploads.strikinglycdn.com/files/b2d2917c-a0e0-4886-8bd4-83c7e381eb23/dozasiwuxowadevi.pdf
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_fd74dea83b8b424a922a788ea01ccb62.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_fe2b697380834c1bbcc181fef7dae8e8.pdf?index=true
    • http://panexorumilogim.myartsonline.com/beethoven_piano_sonata_op_10_no_2.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e626.bin
831d6eee7d6c91343f3571e2f2a4a34e68161c0ef11d72548ebd8bf87dd42de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5088 bytes
font_01_sfnt_off0000f75e.bin
aa03cf1d39df6f594ed7070eab53c99e42b55467f8d732774e54264fcf60ed84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 11800 bytes
font_02_sfnt_off00011cfb.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 4324 bytes

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