Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda74331da570126…

MALICIOUS

PDF

66.2 KB Created: 2021-02-06 21:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 479d51601d1dd170f430ac14fcc6ce4a SHA-1: d72dba65ddf458f6f5b486ba9ee3e9bf57a856d0 SHA-256: bda74331da570126fc3098e5a4789925f6a6987648696290e4635b66245e4f86
104 Risk Score
Tags
free-cdn-ebook-manual-lure

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 URL pointing to 'jottigo.ru', which is likely the distribution point for a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'integrated chinese textbook pdf download', indicating a social engineering attempt to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/123?utm_term=integrated+chinese+textbook+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5fe9064143bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_60125ec0867f8.pdfIn PDF document text
    • https://cdn.sqhk.co/negixakozaxu/tjccifG/free_lightroom_presets_pack_instagram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458631/normal_60062514cae28.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/70e6r4C/wuxokevajujokoxuxufe.pdfIn PDF document text
    • https://cdn.sqhk.co/farosexuto/Iibjf3H/stack_ball_apk_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fc6cda4bcfe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_6002f8db08620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5ff27a21704ff.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/bikikanafopavu/46025048204.pdfIn PDF document text
    • http://karifopiti.epizy.com/rajiroxatisizotezasof.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/fannie_mae_jumbo_loan_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/apache_zookeeper_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/18285483789.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_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 5720 bytes
SHA-256: 2241b34137bd9b3cd916d64ac4aa515e118f737e527aaa4197f14deb0f83bff1
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 10160 bytes
SHA-256: 6c941e84b5c6cedf1325d2d9d9f5400c8e3929909527bf23d3f3d06bfe05548f

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