Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fcd850f0872e23…

MALICIOUS

PDF

81.4 KB Created: 2021-04-03 19:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b48034ac25abb13bc670edfaad8451b5 SHA-1: d84b23381f1c447bbfe016070ebd239e31191121 SHA-256: 47fcd850f0872e231503b9ad5f3d473cc4aad81079082b28f759aede2e7d972a
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with the primary one being 'https://maypoin.ru/award?keyword=writing+samples+for+ielts+pdf'. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'writing samples for ielts pdf'. The presence of external URIs indicates an attempt to redirect the user to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=writing+samples+for+ielts+pdf
    • https://kiwugefifowi.weebly.com/uploads/1/3/4/8/134878570/17b404b884ac9.pdf
    • http://fitness1.space/bayesian_neural_networkshvfk3.pdf
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/lajazuwajedefaduva.pdf
    • https://pikulevixabokof.weebly.com/uploads/1/3/1/6/131606248/nitilipidide.pdf
    • http://pay-order.info/ziwoxufewovh1r2n.pdf
    • https://puwirobazavuwo.weebly.com/uploads/1/3/1/4/131453501/6990757.pdf
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/ffded.pdf
    • http://spain50off.info/mojafupul9tosp.pdf
    • http://werenntaq.online/89452066189dmhj9.pdf
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/tifanevopibugifus.pdf
    • http://menbp.online/are_hisense_tvs_4ke4jy1.pdf
    • https://fuvutefimege.weebly.com/uploads/1/3/1/4/131453053/fuwogepitezajibala.pdf
    • http://zhenskiizhurnal.ru/49277806205bz8gw.pdf
    • http://qwonder.space/hamilton_spectator_crime_reporters3sm9l.pdf
    • http://sparzha.club/wevezalelexu93nmh.pdf
    • https://static.s123-cdn-static.com/uploads/4402737/normal_5fecc3ff9383b.pdf
    • https://cdn-cms.f-static.net/uploads/4459035/normal_603061581b465.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tozaduliwubega/14532432206.pdf
    • https://s3.amazonaws.com/tojabixefova/vukufi.pdf
    • https://s3.amazonaws.com/lokijuronig/76289768014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f336.bin
8b60b58727ec6d0219c223d49ae7e238414c730a766362234d8bb98c7ac1caad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 5160 bytes
font_01_sfnt_off000104b2.bin
847b7ef1ced1c15940f388f63cce754bbb80c8e3973f953c1d2f899294989c50
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 10924 bytes
font_02_sfnt_off00012a14.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 4324 bytes