Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e83d815bc5a75a…

MALICIOUS

PDF

70.9 KB Created: 2021-03-13 18:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4caa2eb35fa94a99c8e7453d079b3e3f SHA-1: bd0d0b2095d8fff29f378b8f5210afd924fb4220 SHA-256: 20e83d815bc5a75a1ffcfa1371eb2c234b719347a76e6d4689e515935fbca8a1
94 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'botokaw.ru', likely intended to host phishing content or a further payload. The PDF structure and embedded links suggest a link farm or phishing lure, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3729

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
  • 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
  • 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/award?keyword=isoterm+adsorpsi+pdf
    • http://tetupamino.mywebcommunity.org/56304329546.pdf
    • http://3-bureaureport.info/betomaliro2izsh.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_60155ae2d79f9.pdf
    • https://javufivupa.weebly.com/uploads/1/3/4/3/134349262/luvowegal_bozumixawora_dorevozud.pdf
    • http://iranianvc.com/inverse_trigonometric_functions_worksheet_class_1274kxa.pdf
    • https://cdn-cms.f-static.net/uploads/4490250/normal_60241d6907251.pdf
    • http://safijejog.mygamesonline.org/anatole_france_penguin_island.pdf
    • http://fakts.design/44175483644hgiio.pdf
    • http://agent-ritual495.online/widukipezaxagomemorenazinrt.pdf
    • http://kupivse.xyz/syma_rc_helicopter_reviewr6g0y.pdf
    • http://dokukuke.mypressonline.com/xiromafumexejenow.pdf
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/a70a8c.pdf
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/nipurubezokeve_xevogavijo_sewavim_bagor.pdf
    • http://tozaworewinox.mywebcommunity.org/how_to_connect_polk_psw10.pdf
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/jefufibirelozu.pdf
    • https://cdn-cms.f-static.net/uploads/4381543/normal_60493a3a11ff1.pdf
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/2575772.pdf
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fe748ee3b094.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60862af3-9d06-4adb-8627-f9ac4c294d9c/nugerokevomotadasef.pdf
    • https://s3.amazonaws.com/tanapilamaxi/life_application_study_bible_nlt_complete.pdf
    • https://uploads.strikinglycdn.com/files/b698e69f-0ce8-44b1-8bff-08842d6017ca/un_grito_desesperado_resumenes_por_capitulos.pdf
    • https://s3.amazonaws.com/ginutu/rifuvodegelane.pdf
    • https://uploads.strikinglycdn.com/files/fc4773f2-5ccc-4159-98ad-62e7efe0bf1e/24430497044.pdf
    • https://s3.amazonaws.com/xopugup/murimakugo.pdf
    • https://uploads.strikinglycdn.com/files/a77145cc-64da-4da4-a386-7bba9eb1cd4a/vupuvabulobujugiwasu.pdf
    • https://uploads.strikinglycdn.com/files/92f289cb-75a3-46cb-8170-7f28fbac45d6/55673727025.pdf
    • https://s3.amazonaws.com/lixuduwonifa/avocent_acs_6048_manual.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d3.bin
4c4d92566c5f89adad1da71c13c6abaf3b1d354793058c98ae01f5e09c9f6060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 4776 bytes
font_01_sfnt_off0000f605.bin
094d26d6c90e1d5614eb5a8f6c2cd6ffe080b9ace724bf32f74130c6d55cc4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 10160 bytes

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