Malicious PDF — malware analysis report

Static analysis result for SHA-256 52830673aee544ac…

MALICIOUS

PDF

73.5 KB Created: 2021-05-12 18:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09b84678b5ed218485b28d326517aa55 SHA-1: bf1c2ba61fe767c9ecafa77b2be612d4420979cf SHA-256: 52830673aee544acb87c7db8838f08b7e07de311f88feaf73f01bb76c60049f1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter specifically identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://xajibur.ru/strik', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xajibur.ru/strik?utm_term=should+the+link+light+be+blinking+on+my+modem PDF link annotation
    • http://robinmani.site/xikelekenesawudevilbrq.pdfIn PDF document text
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/4893947.pdfIn PDF document text
    • http://susasami.22web.org/sivonageruwesiva.pdfIn PDF document text
    • http://medicinfo.online/425124284129etq6.pdfIn PDF document text
    • http://yachtcharter.group/scientific_method_practice_worksheet34t0j.pdfIn PDF document text
    • http://rodina38.ru/7325944153720fc5.pdfIn PDF document text
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/zujulekaxuzivi-fitarokizojo-luliputojuveri.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/8082284.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/bipovoromoj/pigutakigagezutalejab.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/best_c_book_for_beginners_2020.pdfIn PDF document text
    • http://xuvezes.epizy.com/harvard_referencing_style_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/61898819658.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/82507029124.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/niluxoj.pdfIn PDF document text
    • http://nerepigov.rf.gd/jaxosolidejojazejofuzikaj.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/64806020545.pdfIn PDF document text
    • http://nabukewegurizev.rf.gd/verbe_avoir_en_anglais_forme_ngative_preterit.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/android_apps_on_chromebook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/idealism_and_materialism.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/what_is_the_theme_of_the_odyssey.pdfIn PDF document text
    • http://zefofipavefo.rf.gd/5714731781.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_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 5164 bytes
SHA-256: 82ddd2a4cb179d1f87bbba856784c71f48c8e865e76a1ca5d92852741d4392f5
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 10684 bytes
SHA-256: 1a331d512352144ffe590e6e00f268097d2af2f2df7dec990d93e2aa1b267fc6

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