Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2d74319a104582…

MALICIOUS

PDF

72.6 KB Created: 2021-05-19 22:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b528c94a27ddbe45da350e1528f6efe0 SHA-1: 5582ab5f3b1aafcad585336c260b382519db3adb SHA-256: 0a2d74319a10458203c87d785e66e70c423df1d4afc07a17481cf598c4ec38c0
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to probability tables, directing the user to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of an external URI and the document's deceptive content point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maypoin.ru/strik?utm_term=how+to+find+the+probability+in+a+two+way+table
    • https://cdn-cms.f-static.net/uploads/4379842/normal_606a9a98e2229.pdf
    • https://cdn-cms.f-static.net/uploads/4477877/normal_60223e98ca730.pdf
    • https://cdn-cms.f-static.net/uploads/4392853/normal_602af81f1f613.pdf
    • https://cdn-cms.f-static.net/uploads/4408460/normal_600f89f2cda03.pdf
    • https://cdn-cms.f-static.net/uploads/4458622/normal_604e30cbb471d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vufuzewasi/wilodujiwumugomof.pdf
    • https://uploads.strikinglycdn.com/files/2b40d6aa-08f2-4cfa-ac79-8b3f8ee62a85/what_car_seats_go_with_bugaboo_donkey.pdf
    • https://uploads.strikinglycdn.com/files/1ffbc6d3-bbe0-4f4b-8bef-cafcb1c0f7a5/python_3.6_free_download_for_windows_10_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/d53cb004-18c0-4bea-9031-6e6c8c5fa1a8/68251167321.pdf
    • https://uploads.strikinglycdn.com/files/a5f9e1cf-f7a3-4db2-9817-45714cfa8618/pufojejujopefotozimepo.pdf
    • https://uploads.strikinglycdn.com/files/3814f6d0-ab77-4df2-8aac-8ad993641b60/gekexujutetenebawebubexip.pdf
    • https://uploads.strikinglycdn.com/files/7162f269-0f76-4f52-9243-ec7d2386e22e/a_que_se_debe_zumbido_en_el_oido.pdf
    • https://s3.amazonaws.com/tobito/jixekibixafi.pdf
    • https://uploads.strikinglycdn.com/files/bf1f1a35-c4c2-46c4-83d8-2eee077d71d6/35844187690.pdf
    • https://uploads.strikinglycdn.com/files/bbe5039e-434b-4d01-9cf9-e00de6dbb05f/89724115492.pdf
    • https://uploads.strikinglycdn.com/files/012cb156-c15c-4c32-812c-c23cfe59fcf4/significado_de_los_pasos_de_la_misa_catolica_para_nios.pdf
    • https://s3.amazonaws.com/fidobakipivogit/lubaz.pdf
    • https://uploads.strikinglycdn.com/files/e7e31e85-c803-4c43-a1e0-56f9172a7663/rugisesami.pdf
    • https://s3.amazonaws.com/lumixi/ratob.pdf
    • https://s3.amazonaws.com/biwubeleba/jekive.pdf
    • https://s3.amazonaws.com/pulavokaxe/76062657244.pdf
    • https://uploads.strikinglycdn.com/files/b0b4f3a3-b0ea-499b-9fd8-1651afbf1aa2/zoom_h4n_ext_mic_input.pdf
    • https://s3.amazonaws.com/fovezewi/assignee_vs_reporter_jira.pdf
    • https://s3.amazonaws.com/pirosisob/gusesadadevaguz.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec55.bin
ba9a003884cde85e7ac13b9383f4baa458745a5dac5d78c2881e73ca9ce775f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5248 bytes
font_01_sfnt_off0000fe37.bin
e76da902e861d883f3342c8b81c9684689438bfbd9c7780b0ebaa137198ded66
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 10712 bytes