Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb75d787b45586d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 09:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8832b3d02366246c4bcdfc38451c0b12 SHA-1: 0794d9c6f63d4a928c0ab27c691e1693c37e2c07 SHA-256: 3eb75d787b45586d125aeb4d925bb6490507bfb13d1833f48e093b5b6ef3c2d8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to obscure malicious URLs. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body, though heavily obfuscated, suggests a lure related to downloading a dictionary, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/award?keyword=download+russian+english+dictionary+pdf
    • https://zogumunatol.weebly.com/uploads/1/3/1/6/131636745/6566289.pdf
    • http://pearhaidhr.fun/art_models_bookp0iad.pdf
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/fefezijebalogutexor.pdf
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/39b195bf3.pdf
    • http://redirunna.xyz/what_is_a_unanimous_consent_voteik2f6.pdf
    • https://gawinageriju.weebly.com/uploads/1/3/0/8/130874076/wodipar.pdf
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/nexukunekubezog.pdf
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/2ff98fbd473e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/davubewu/lentiform_nucleus_arterial_supply.pdf
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_a35b2388e09a4108924444fb0b994074.pdf?index=true
    • https://s3.amazonaws.com/gelawiweza/wedusowiro.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_08bf76c35fa04982b53f82d32caf903a.pdf?index=true
    • https://s3.amazonaws.com/winumigutam/faberezopezex.pdf
    • https://s3.amazonaws.com/robumuduluwise/metric_conversion_worksheet_9th_grade.pdf
    • https://s3.amazonaws.com/nazekisigiduz/xojemozamuguxedelav.pdf
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_87302c4e23a942eab03ac640bef3d7f1.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_6663994ad42348e19bd42b8197eb7fae.pdf?index=true
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_53541e98b4ad40909a83376757ee1bd6.pdf?index=true
    • https://s3.amazonaws.com/wupagivoz/automatic_call_recorder_pro_apk_latest_version.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_off0000e05f.bin
ca2adfd3cee167ba9db74196f53e3d4b640bfea27935da8e51373628b9da3bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 5612 bytes
font_01_sfnt_off0000f391.bin
298b7990594b2bdf315a23eaf28681d2526275873cf28b40be0ddf2e2f73c8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 14536 bytes

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