Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb0ee1fa6596a23…

MALICIOUS

PDF

80.5 KB Created: 2021-05-20 05:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3475faf6a6daab7d2472dae8846942bc SHA-1: 5cfc6ef71e7959551759a66e8455912bd4b9ecda SHA-256: 4eb0ee1fa6596a233287e9a2ebc9bbb69077f65ab02363cf061e3b98c37bfeb5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign-looking PDFs but one suspicious URL, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

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://xezojetit.ru/strik?utm_term=la+ley+del+espejo+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5fef822b59fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_601ae60045627.pdfIn PDF document text
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/kudilun-lubup-xunana-gogow.pdfIn PDF document text
    • https://sumikoxivabozo.weebly.com/uploads/1/3/3/9/133997645/a59f5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5fc7e3c78d7ba.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/kavifunaruvi/shirt_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/arthdal_chronicles_eng_sub_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/coliform_testing_lab.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/nutiwabixosanufalod.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/what_does_true_blue_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/how_to_clean_a_quadra_fire_pellet_stove_insert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb48950-a6e8-4311-9672-2c022fd910b5/67749804154.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/letit.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/how_to_calculate_va_rating_of_current_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/citrix_receiver_catalina.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/82555563875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52228f0-43d2-4c5d-a153-2dab2d45287d/what_are_the_similarities_between_ziggurats_and_pyramids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e0295a-0021-45ed-9a9c-8f1d7f8be30a/sababelafurumam.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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 5328 bytes
SHA-256: 01889fa7715fadc61856ce28bdd888cb0e151f493fcc1c1735f94f6a0dd35c97
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 13388 bytes
SHA-256: 188bfa93ef679d818227380803d8179cd26dbbbffcafd7c58ba07ef1e2d954e1

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