Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96544374a5b36d8…

MALICIOUS

PDF

78.3 KB Created: 2021-06-06 13:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2dc3ff315931baee9bb96177c3e2ea8e SHA-1: c8ac5578be9166578187254780ef2cf8ccf1a6b4 SHA-256: f96544374a5b36d8443b88a1530c1d0b7cc655a4da31637879f4c5adcd1d6534
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'inwebjor.ru', which is likely used to host a malicious payload or phishing page. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall context suggests a phishing 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://inwebjor.ru/pbw?utm_term=capriccio+24+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381083/normal_5fe23dd136233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_6026a3566fddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_6049b4da217db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490974/normal_6008ad219fb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_6036ae6ac3ad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fca265166263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_6018a1dfc5a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_602274603a1cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fcb3a05e69ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5feb7f6dea169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_603a4aed42631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_600ff90cb3be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_6039f44ee70e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_600bfe30cf7ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374364/normal_6000b6ad81c17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxiwako.pbworks.com/f/camp_zarahemla_morgan_utah.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/144654930/fofapopamuxekexuk.pdfIn PDF document text
    • http://sowenux.pbworks.com/f/asphalt_8_all_cars_unlocked_file_download.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144439566/27770311110.pdfIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144601563/vizio_m_series_bluetooth_pairing.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 5064 bytes
SHA-256: 314191f99d2e35bbd8ffb687ff3f711e044ff040d4240e88724dd6c0009ca428
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 12428 bytes
SHA-256: d8b26b8e3cb901692a6b844704af0efc1d63c80a1ba92ed18bc93d90244756aa

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