Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd9fc039354affc…

MALICIOUS

PDF

64.7 KB Created: 2021-02-11 10:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8139bcb2a12725f93962c961688aae0 SHA-1: ca45438f992855e1a2b477ac2aa656eec6575e35 SHA-256: 4dd9fc039354affc163686f5babc1f179cda0af687c85cf936b8b4f1083420a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://druttle.ru/wb?keyword=german%20shepherd%20dogs%20pics%20free PDF link annotation
    • http://forsage.pw/sam_s_club_cake_designs_catalog426v9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5ff8a3e33ce40.pdfIn PDF document text
    • http://mini-cam1.club/zekoxadawuvedewekapivuy3ho1.pdfIn PDF document text
    • http://detonic-ufficiale.website/mary_poppins_scriptdipyh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5ff208e2a34ed.pdfIn PDF document text
    • http://save50.pro/vocabulary_workshop_level_b8ogr6.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/534704.pdfIn PDF document text
    • http://springital.fun/consecutive_odd_integers_word_problems_worksheetvfbqf.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/f208a5481.pdfIn PDF document text
    • http://copyrighthelp.info/completing_the_square_practice_problems_and_answersusb1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5ffad2d39f2aa.pdfIn PDF document text
    • http://wegansit.space/basic_category_theoryuk4kt.pdfIn PDF document text
    • http://fredo.bike/deropudamal5d3px.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/76231d.pdfIn PDF document text
    • http://foodguideblog.com/bootstrap_alerts_formsaqbz9.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/tikofaketonub/kefaxopuxexorababonun.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/chinese_zodiac_word_whizzle_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/23020703905.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/12397962440.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/online_games_car.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/lawudom.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/endorsement_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/assign_script_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/karwar_tourism_guide.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_off0000c033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC033 5568 bytes
SHA-256: e1f1f3b374da92c8baa9e38bacd21328d118495c0452efce0192e7bb163a9c26
font_01_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 10140 bytes
SHA-256: 802fc3a74e2202e0ae5e935d660e6665bc06fcf683993aa50d8bd032657d5d27

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