Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f677ec3b26c42d…

MALICIOUS

PDF

81.9 KB Created: 2021-03-17 01:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a397b8c6719ff0cdd3e6d35658c5585c SHA-1: 194a8d903281b2ce18a021ea49d5d20fc8c9f1e8 SHA-256: 49f677ec3b26c42d404906f97b65836cf829de7eb9afa19ec5d9933efb14e6a0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic and an external URI pointing to a suspicious domain further supports a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a syllabus, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=kuk+syllabus+of+b.+tech+cse+3rd+sem+pdf
    • http://prodive.su/1448687298ze11q.pdf
    • https://static.s123-cdn-static.com/uploads/4459936/normal_5fcc8c963641f.pdf
    • https://static.s123-cdn-static.com/uploads/4390381/normal_60020d8cdf4f9.pdf
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd11bc5e0ef9.pdf
    • http://tryadasert.online/bram_stoker_dracula_quotes7jra0.pdf
    • http://pay-order.info/rbi_guidelines_for_inter_corporate_depositsri294.pdf
    • http://pirojibanenuzi.getenjoyment.net/63859749777.pdf
    • http://pipazodonuwadu.iblogger.org/55262159669.pdf
    • http://tufuwavaziga.mygamesonline.org/5839758968.pdf
    • http://tiktoktop.design/how_to_type_roman_numerals_on_mac_keyboardvzfwp.pdf
    • http://smeshnoykir.space/domino_s_pizza_near_me_telephone_numberw0xqj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rikovaniroxatox.rf.gd/82390332390.pdf
    • http://gamigigoloje.epizy.com/philips_norelco_multigroom_7000_change_head.pdf
    • https://s3.amazonaws.com/kujapomib/android_activity_lifecycle_on_rotation.pdf
    • http://romakilax.myartsonline.com/voxedumoweboj.pdf
    • http://sazebufaz.atwebpages.com/dowajativ.pdf
    • https://s3.amazonaws.com/wavunot/87014238776.pdf
    • https://s3.amazonaws.com/bejokazemur/mobaxazilosimuxoveguj.pdf
    • https://s3.amazonaws.com/tuzakifezara/aplaceformom_phone_number.pdf
    • https://s3.amazonaws.com/fibesezati/activesheet._querytables._add_field_names.pdf
    • https://s3.amazonaws.com/nodetuxapabara/vuniridinesinos.pdf
    • https://s3.amazonaws.com/fopalew/ansys_hfss_installation_guide.pdf
    • https://s3.amazonaws.com/teximikamukubo/how_old_are_the_characters_in_war_and_peace.pdf
    • http://pederufe.epizy.com/vintage_tecumseh_engine_parts_for_sale.pdf
    • http://doriponesarom.myartsonline.com/sugiwofuj.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_off0001017a.bin
8043fc20dd3bc3091c6647d379aacfaa50f1562e2edabc720b7eb0a5913c2cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 5864 bytes
font_01_sfnt_off00011550.bin
e8c90f9ad0fd1339fc65d1744f39511cb250db8a469050df1bb5494ddd531fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 10720 bytes

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