Malicious PDF — malware analysis report

Static analysis result for SHA-256 b106d5a0750ae8ed…

MALICIOUS

PDF

76.3 KB Created: 2021-04-22 06:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5355e7c56acb81a2c19221a05f7b946 SHA-1: 75d40179f860f0cc336ea969c9cb74deaf24a74b SHA-256: b106d5a0750ae8edcd6b2d57df1c9b1a03b8c065625073b1a7af41d739f9bc25
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier flagging indicate malicious content. The embedded URL and the document body's deceptive title 'Excel vba range rows delete' point towards a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=excel+vba+range+rows+delete PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5fc90deb046f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_603e088db75cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408983/normal_5fcfa18f2420b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_605b4cce3ffdd.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/gygjmjf/17664809298.pdfIn PDF document text
    • https://cdn.sqhk.co/zeritogekuja/ajJghO4/siduviveta.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/jjggtgg/kejawifepaw.pdfIn PDF document text
    • https://cdn.sqhk.co/morexemodoju/Jj6sjfb/jogirifubizonilakitu.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/meR1jb3/best_photo_transfer_app_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458838/normal_5fc989368ce29.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/d4HhdDu/queen_city_running_store_west.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/zuwosil/70596984330.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/43505768446.pdfIn PDF document text
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_c3d4e4bb8c534186b52dfd56a0535c61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/chubbies_swim_trunks_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/levezawifago.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/meseguwexumiw.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/disgaea_1_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/bear_cartoon_head.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_38c783ac1b6d430b8b6d1ef4e91e81a0.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_eb1a2791362c42f898c1164ae2c917cc.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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5424 bytes
SHA-256: 79eb04e8da7c33a7c28134140341ee70193124ac5294fbc224aa9b6ed3d83a6e
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 10860 bytes
SHA-256: 727302a6b0db6318da6b7403fb3a4877999839d4e06b5df2ebea06be4343ed6e

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