Malicious PDF — malware analysis report

Static analysis result for SHA-256 948bd64910a1643c…

MALICIOUS

PDF

77.4 KB Created: 2021-04-15 09:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda5ac064320d3b4d520108af4bfdf65 SHA-1: 24385f58b4b1876a5c2decd1de882112c55e52ee SHA-256: 948bd64910a1643cfcedc6c56bcd4fbac5755c6503eb1686f8b6de07e1664e47
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and the document body, though heavily obfuscated, suggests a lure related to a 'central heating system'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=how+to+turn+on+central+heating+system
    • http://medupaj.iblogger.org/character_certificate_in_english_form.pdf
    • https://cdn-cms.f-static.net/uploads/4466662/normal_60687234ec935.pdf
    • http://alphabitx.com/wejujenesoxufufize8brwe.pdf
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/f13f08b.pdf
    • https://bavopubenexe.weebly.com/uploads/1/3/4/6/134678362/xokivepu-revodadubeji.pdf
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/525059.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/xugetobisofateped.pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/baa997dcccfe73.pdf
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/rivopakir.pdf
    • http://fisurigata.22web.org/95033311493.pdf
    • https://cdn-cms.f-static.net/uploads/4464301/normal_6065e40ecb48d.pdf
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/kenefupilabi.pdf
    • http://bewalunokonu.22web.org/39081089760.pdf
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fd77d494fd89.pdf
    • https://xukarujejoxa.weebly.com/uploads/1/3/4/5/134597636/1771319.pdf
    • http://easterthjg.com/41311292206pznuc.pdf
    • http://lonewawojelos.22web.org/biot_savart_law_application.pdf
    • https://cdn-cms.f-static.net/uploads/4459467/normal_602d43fa44eb9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fusifovizit.rf.gd/wewaluvuvowuvonevepudimop.pdf
    • http://femubavavozemag.epizy.com/pdf_file_compressor_app.pdf
    • http://widojedup.epizy.com/63222579410.pdf
    • http://wokanulobasanek.epizy.com/zewajitonu.pdf
    • http://rikukevez.rf.gd/vamadexumazum.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_off0000f2bb.bin
91f44248abf58db2b8417385d1b834b7289503b1e5eb91f5333fe63350da2a46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 5368 bytes
font_01_sfnt_off000104e6.bin
fb4df13a914966fc2aa704c8ffe0620cfc8a9e29752c221df6d1021abd02ed07
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 10184 bytes