Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c8d1210db688a3…

MALICIOUS

PDF

74.8 KB Created: 2021-02-20 14:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3f52162fce8a89405ebbdebd6898f612 SHA-1: 9c2282b8d251b1eaa87802546d088b5677c0c237 SHA-256: 51c8d1210db688a3ea12a95bdcd59108325e501515129c916447a793f5257efb
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, with a high risk score. It contains an embedded URL that leads to a suspicious domain, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to setting up a DVR, which is likely a lure to entice users to click the malicious link.

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://jacksth.ru/strik?utm_term=how+to+set+dish+dvr+to+record+on+tv+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369332/normal_5fcbeee66a4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fd85e36dd17e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5fd0e23646198.pdfIn PDF document text
    • https://cdn.sqhk.co/mibazudifij/gdhb3jc/49108964856.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/igJlhhT/ranaregexigirozanataves.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/vieSRGh/tiktok_mashup_clean_2020_new_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jvhe0gh/tactics_ogre_battle_mechanics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fd2040286fa8.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/zifilobesumafi/tezubemibilubixa.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/cbt_worksheet_for_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/past_simple_present_perfect.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/74056519352.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/blur_image_background_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/filezilla_free_for_win_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/xoloburipidone.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/vue_axios_post_x-_www-_form-_urlencoded.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/84162460803.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/android_studio_set_text_bold_programmatically.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 4952 bytes
SHA-256: 8e029a3f6880e1bc9288249092f6c15de833645531b5d4f33f1aadeff6865aac
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10252 bytes
SHA-256: f16557b9923c930d99cd7eb3942afb3ae2098de2b159c67cc1fb4708edc6fe61

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