Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba7e0e125004e11…

MALICIOUS

PDF

96.7 KB Created: 2021-05-24 14:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d5d447e1b37ce7aac7bdfcf9244bc5ad SHA-1: 2f2ad43548f0f314f2fd35e0908617090fb2f4ac SHA-256: bba7e0e125004e11f7cbb4330ec237d4c3cb21e818a288aa7296e731bb91a27d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document is part of a link farm designed to drive traffic to external 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://kuzutuzo.ru/strik?utm_term=why+was+the+roman+empire+so+important PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427785/normal_5ff17b0adb4ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417406/normal_5fe464876aa91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_603c3af6a1d2b.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/gaxesumo.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/6191174.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/40896578095.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/cinema_xxi_film_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/what_is_the_meaning_of_youth_subculture.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/adulthood_development.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/bashir_ahmad_bengali_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/26638806688.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/memunuxomimivitipum.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/integrated_circuits_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/vocabu_lit_lesson_5_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/block_games_block_puzzle_games_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/bitmap_to_png_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/supirokolifaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 1608 bytes
SHA-256: dd7d963915ff5ce2820d0c557646bb2d897b191abccf3b5548a254835446ca7b
font_01_sfnt_off00013eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEC 5236 bytes
SHA-256: f2fd2f49ce7f8c8dad4974fcdb1fc6585502fdef412f4e12e3d6af7e7c144cb8
font_02_sfnt_off000150a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A9 10240 bytes
SHA-256: 17b5784a4e2944260ee222366f90eafc8d488f56ff4e5419a1fa4bbd84348019

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