Malicious PDF — malware analysis report

Static analysis result for SHA-256 83515ef928f382b7…

MALICIOUS

PDF

167.7 KB Created: 2021-04-07 22:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2fac4887588d8d8cef110a7b4b306c9 SHA-1: 7c0d1ecce9517b104439dde7f02765fb1160a388 SHA-256: 83515ef928f382b70988d3edf940802abf6e3057d5d0f78c0369eb8732fdfc64
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it's a lure for recovery secrets or private keys, a common tactic in financial scams. The embedded URL points to a suspicious domain, likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/123?utm_term=tor+browser+linux+free
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/9810230.pdf
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/juwidoluzefuzubatan.pdf
    • https://muwamobole.weebly.com/uploads/1/3/4/3/134356931/suvuvobuwevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vebenok/small_cute_babies_images_hd.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/27301301575.pdf
    • https://s3.amazonaws.com/baposivarabuj/negimaxomoga.pdf
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_ee1a75e604aa4b208afddc66ef2a5893.pdf?index=true
    • https://uploads.strikinglycdn.com/files/495316f6-6f95-4934-a490-7397aeb68405/koxoturanodiwobage.pdf
    • https://uploads.strikinglycdn.com/files/6410079d-b7e0-43f9-85f9-8343db2b27bb/pdf_el_juego_de_la_vida_y_como_jugarlo.pdf
    • https://s3.amazonaws.com/pusori/wagner_wood_and_metal_paint_sprayer_w100_-_280w_reviews.pdf
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_52df445942674372bb2cb35b59414f42.pdf?index=true
    • https://s3.amazonaws.com/vesubodufisi/66944574871.pdf
    • https://uploads.strikinglycdn.com/files/c5176cbb-1c2e-4cfa-b321-9be9cf0403c8/carrier_weathermaker_9200_manual_reset.pdf
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_e717899fac6542b8b14a5628a4c08a9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/10400c7f-9c9c-4ca6-99b4-a70342d5c6eb/1060945164.pdf
    • https://s3.amazonaws.com/febopa/kixavopamegaloxulido.pdf
    • https://s3.amazonaws.com/xugigabitulu/what_does_the_quran_say_about_usury.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_off00023b0c.bin
7d7c82ed50ce2b1135cb1e3f5ba2b688501e78e9061ec96931e362a8b91166a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23B0C 4800 bytes
font_01_sfnt_off00024b86.bin
3f62623b67402deb9914e610a2a29fa6353e627cf77902bd8577606a96778f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24B86 15204 bytes
font_02_sfnt_off00027c36.bin
ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27C36 16148 bytes

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