Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35803b36749a843…

MALICIOUS

PDF

73.1 KB Created: 2021-03-10 12:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ee03a30de60b899062306c8e6c26ed0 SHA-1: e3953420e64ac21bac5103b8a18fb2a2fbb3f55f SHA-256: b35803b36749a84320105a11d3b846bb2f78092f9ece0d358e09b40e0b6a46c3
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to 'https://nipisod.ru/123?utm_term=performance+appraisal+comments+customer+service', which is a suspicious domain. The document body, though heavily obfuscated, contains text related to performance appraisals and deadlines, suggesting a social engineering lure. No scripts were extracted, but the presence of external URIs and the phishing/trojan detection indicate a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=performance+appraisal+comments+customer+service
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5ff5716c19e46.pdf
    • http://dikerulaba.22web.org/dinupim.pdf
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5ff8b407cd731.pdf
    • http://djami.ru/child_of_god_cormac_mccarthy8ivxp.pdf
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fe3a728b2a00.pdf
    • https://static.s123-cdn-static.com/uploads/4451756/normal_6007a2be13a64.pdf
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5ff4db48019f8.pdf
    • http://copyright-supporthelp.com/how_do_i_reset_my_truma_water_heateraeqmp.pdf
    • https://static.s123-cdn-static.com/uploads/4375077/normal_5fdf7fab38e5e.pdf
    • http://zifasito.22web.org/future_indefinite_tense_exercises_with_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bd242f3c-1edb-4999-bcb3-6a568cb109c1/volca_sample_2_vs_1.pdf
    • https://uploads.strikinglycdn.com/files/6601f8c4-b486-4773-bb7c-d3593c3fa0b7/how_to_remove_call_blocker_on_bt_xd56.pdf
    • https://uploads.strikinglycdn.com/files/4bf67941-6008-4166-8b79-781d59585a3d/94652940730.pdf
    • https://uploads.strikinglycdn.com/files/fd8bf274-1007-402e-8d92-0346609e48ae/how_much_does_10_minutes_of_jump_rope_burn.pdf
    • https://uploads.strikinglycdn.com/files/3d0664bf-7e20-4a95-a42d-1839c3fa2ed7/doll_house_for_boys.pdf
    • https://uploads.strikinglycdn.com/files/1a57b933-ee56-4814-9f79-a2dc92dcbf64/80953082997.pdf
    • https://uploads.strikinglycdn.com/files/a98e99c9-fe1c-4f9b-bafa-7cf59e543323/rebanakuxowazonilorozer.pdf
    • https://uploads.strikinglycdn.com/files/8303a48c-5639-4763-8bf9-fb3e8303a92e/bowisujitij.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa4.bin
8ed12dac0cdde28ea13dd30b57c304b48f53f9c4894048ce9e59809dbc8636bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 5220 bytes
font_01_sfnt_off0000f155.bin
5890368f27ae5d734e70dfa3d95f6dfbae4c2a12b347154effbe7fd632d5a2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 11152 bytes

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