Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4266f45f2c8553…

MALICIOUS

PDF

70.6 KB Created: 2021-02-14 16:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e14f59e9de6ee2edf03ad761cdd5eec2 SHA-1: 748acc0886b6f15b35a5cf65b84181006d389b75 SHA-256: 5a4266f45f2c855301e2d7426549e3de20aa45011885e987bf7cc8a3719c8844
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 pointing to a suspicious domain, likely intended to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to online letter writing, which is a common pretext for phishing attacks.

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/wix?keyword=write+a+letter+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5ffcba38cd72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fd0e06ac5608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600f87b891df3.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/ghiaijX/88124691527.pdfIn PDF document text
    • http://dommasters.site/besifadapapukax0w8zm.pdfIn PDF document text
    • http://front-glass.space/visa_invitation_letter_australia_template6c5ov.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/7Ugt6D9/wiserakikawedinopovupatun.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hhgghjg/gigezenumenasera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_5fd9784d85775.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/jehe85d/mimosu.pdfIn PDF document text
    • http://stingeksoj.online/download_game_super_mechs_mod_apk2nx4h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/batman_dark_knight_rises_apk_for_oreo.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/camisas_de_vestir_para_dama_uniformes.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/levolekelab.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/51917265819.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/baitarani_lo_baitarani_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/83513306584.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/32836307615.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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 4512 bytes
SHA-256: f40db94c5cf1475f7ddf9145e310fce59fdfe0d5b43ea02c9e55072e09c93b87
font_01_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 9964 bytes
SHA-256: 8aa6ab3982ea26333e3d5bc69ae29872b89716ad335408e1013f296b08420620

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