Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b91b66ada90643…

MALICIOUS

PDF

79.8 KB Created: 2021-02-21 12:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5a252c4a4f86a975260206d56b19d2b SHA-1: bc0b49f64f6487fdf1bbf7fcc9d4494d20ddf29b SHA-256: f3b91b66ada90643cb64b49b8f5241a285342354c70635d3c9aa63bc796ca0b4
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that directs users to a URL related to printer problems, which is a common lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit user curiosity or technical issues to redirect them to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=why+is+my+airprint+printer+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376354/normal_60219e0708ef1.pdfIn PDF document text
    • http://ca-management.website/firusudafeneruxevowufipqxjzn.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/jhhhE1T/fire_emblem_heroes_dimitri_savior_king.pdfIn PDF document text
    • http://setifol.66ghz.com/free_easy_christmas_piano_sheet_music.pdfIn PDF document text
    • http://manetebanax.22web.org/ejercicios_alcanos_alquenos_y_alquinos_resueltos.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/digital_marketing_ebookfm6am.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5feb73840ebaa.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/cifjcjc/amazon_prime_now_gutschein_erstbestellung.pdfIn PDF document text
    • http://detonic-ordina.website/751569363409yb31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6010da7ddad53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_6028ee90ce8fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/dependency_hell_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/danganronpa_v3_gift_guide_steam.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/angi_homeservices_inc_annual_report.pdfIn PDF document text
    • http://jakunivejejaxo.rf.gd/39314207176.pdfIn PDF document text
    • http://savekuf.rf.gd/bahubali_movie_video_hd.pdfIn PDF document text
    • http://gewapapis.epizy.com/obras_de_alejandro_dumas.pdfIn PDF document text
    • http://fububosuvakosal.epizy.com/equations_for_uniformly_accelerated_linear_motion.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/4219395708.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 5260 bytes
SHA-256: d83c10ce4da066d57ff1237bd0da367aaee72ccf0faabe903d3e678ff2801ba3
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 10592 bytes
SHA-256: e0af0455da782b516ced38f1ea7d5e991abdc9d022f577c65d27fa255e1bb0e7
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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