Malicious PDF — malware analysis report

Static analysis result for SHA-256 7143dc02500ae76e…

MALICIOUS

PDF

100.8 KB Created: 2021-04-25 19:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 13c3e969272a3423f0a831dc888a9ec8 SHA-1: 76d82c591463a5742f0beb1299a8ab826016d1f4 SHA-256: 7143dc02500ae76e24607e957852c30e4463bac071515b2c8c3ddd22d1e931ce
156 Risk Score

Malware Insights

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

The PDF contains embedded links to external websites, with the primary URL being 'https://mezovuduw.ru/strik?utm_term=dell+optiplex+9020+motherboard+specs'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=dell+optiplex+9020+motherboard+specs PDF link annotation
    • http://xibiselid.medianewsonline.com/40061479566.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/16799445386.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/muvirawesagi.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/wordly_wise_book_8_lesson_4_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fd9949589d26.pdfIn PDF document text
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/solagiwakuwamowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_60225c839755a.pdfIn PDF document text
    • https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/bamajofilegigeru.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/tomaroduxu.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/character_traits_word_list.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/tobobowu/niremidakodazepi.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/how_does_whole_foods_order_pickup_work.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/lesson_10-1_reteach_developing_formulas_for_triangles_and_quadrilaterals_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e757a17c-c72f-4710-bd81-8d1eb070dc0d/9281484380.pdfIn PDF document text
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_a3d8f0a8dd4e4a7d80c1f70a0ad8c138.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d349b70-0bdc-4268-9703-b087ab4b9e0b/targeted_literature_review_vs_systematic_literature_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/24036224640.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/72614627384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14015f18-2eec-464c-bd80-3e371374dc63/8175882044.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_ded9eea0145b44259ed8ea5dd782556c.pdf?index=trueIn 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_off00014814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14814 5952 bytes
SHA-256: fb43501077ec6f2e158de69f82b4aa5fc2baeddbefc2cc53edbb6236a04fe86d
font_01_sfnt_off00015c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2D 11924 bytes
SHA-256: dc61143681df0cc3586336c59cc165866b0183524e4a85621e3ab139dae8eb0c

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