Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61a9d938b42f33f…

MALICIOUS

PDF

94.0 KB Created: 2021-05-21 12:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fe39bc579b95f6edd8271cb0ce4e784e SHA-1: 5fb415f2b7e91d84af7f4421385d80768f3bba75 SHA-256: c61a9d938b42f33f56b4aad7868d800a937d7737c0c341252f53a71f503b133b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets, which is indicative of a link farm or SEO spamming technique. The primary malicious URL, 'https://nipisod.ru/strik?utm_term=descargar+los+juegos+del+hambre+2+pelicula+completa+en+espa%25C3%25B1ol+latino', suggests a lure related to pirated movie content. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=descargar+los+juegos+del+hambre+2+pelicula+completa+en+espa%25C3%25B1ol+latino PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5fca3cc25ff96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fea26bd8adec.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/guwakofetiribuza.pdfIn PDF document text
    • https://rogusavonovupe.weebly.com/uploads/1/3/3/9/133997589/nuvelepisogazu.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/5195775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_603901b70bfd8.pdfIn PDF document text
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/6d004cbe.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/kujapomib/essential_business_vocabulary_builder.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/palozalukofazedenip.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/tefukowimodurozegasi.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/43554275025.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/cafe_racer_mod_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/fairy_tales_stories_in_english_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/kemiwujiroxen.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/pawugozipo.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/expecting_more_the_4th_trimester_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/palmistry_reading_for_male_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/27475450513.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/fema_is-_363_answers_quizlet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 4740 bytes
SHA-256: 44dacd330212deedf00f67d4be96c2b0656b6c2c1fad2cba5796487c58a703d9
font_01_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 6048 bytes
SHA-256: 46c2565afd050cd5fbf8071d8caf4f315e59377b6b23ff21d49c59121c01b149
font_02_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 12328 bytes
SHA-256: db85d32b4ee4dffe3dbb4ad7976b97cd2b8ff40874db6793ee3f08809ae26653
font_03_sfnt_off00015134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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