Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaa4e3656e5a3d1…

MALICIOUS

PDF

76.4 KB Created: 2021-02-24 01:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 69fd75385aecbda6b9ddf624ed8de005 SHA-1: 743e324f478315d2bf6e35ec8078b61f73fdb7a5 SHA-256: feaa4e3656e5a3d1d7956cbdd9c3518cf1eddfd372a42bb41c26775bf6361b82
104 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate the presence of an external URI, specifically 'https://jottigo.ru/wix?keyword=reddit+upvote+bot+github', which is likely the malicious payload delivery or phishing site. The document body contains urgency-related text, further supporting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=reddit+upvote+bot+github PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5fca7f8c25f03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fc86601d3707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6022143958dff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_60357cc74f283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367635/normal_5fc8d99bb4e44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5ff5420d4c13a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_60124f6dbf915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatinilub.epizy.com/be_going_to_exercises_perfect_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/18479084734.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/anemia_falciforme_porque_es_hereditaria.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/vigojegifevafune.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/80956301928.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/bittorrent_android_port.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/kizafugune.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/lubuvumutidepubak.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_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 4912 bytes
SHA-256: 5ecac05fd6cae486ef148378873bd942cefda35423284f310da6052ba02396b9
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 13616 bytes
SHA-256: d211685da898a03c7dcfeac62598fddee28f1959f91c5b7f0a2a43265d73e3e7

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