Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f373bccf5491f12…

MALICIOUS

PDF

67.9 KB Created: 2021-03-22 22:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8f9f3052f3d04177a16da09a962be936 SHA-1: 40127503315a24df0454c1533a8eb467be7f0d17 SHA-256: 5f373bccf5491f1297047a6970a83d2faf95d0d018470a851b47fdea33d714f1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=magdiel+lopez+tutorial PDF link annotation
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/3721769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_602fedf87f828.pdfIn PDF document text
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/vimem.pdfIn PDF document text
    • http://kukogekaw.sportsontheweb.net/lazolizusidemifarubaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_6039cd23d48f2.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/duviwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6032bcdce9d34.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/long_john_silver_meal_deals.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/kifunemexusidipadevow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toponetivipabar.rf.gd/aster_flower_information_wikipedia.pdfIn PDF document text
    • http://sibugisijan.epizy.com/fuzugoxowokopegeko.pdfIn PDF document text
    • http://tumanababaxa.epizy.com/amity_university_kolkata_admission_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c27129e-dd11-4c14-9fed-02a2f9d0b212/percy_jackson_and_the_olympians_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/nuvigajix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42989f3-a749-42ff-99a5-d62f8541d39f/interview_questions_and_answers_in_html_and_css.pdfIn PDF document text
    • http://xonukekavufimil.epizy.com/bdo_archer_aakman_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/20689415111.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/tedalugemif.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/44085683593.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_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 5004 bytes
SHA-256: 9de99ace5e96500148b2825350c6ff6f23bd169b6a7d01af20d03b7617d75cb1
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 9940 bytes
SHA-256: 744a34544aa60be64705f47a0c563e113200d41826a770b0260f0127b3c5b962

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