Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d4f437561eff35…

MALICIOUS

PDF

83.1 KB Created: 2021-02-12 03:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca622f8f30d872355108b01ffd3e4b50 SHA-1: 4852ffe376811d58a05723b640ec0944adfa01b8 SHA-256: 10d4f437561eff354a0fbacf9cbc2cc84dec54e55f4b4c5b222f606484bdae71
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 designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. The embedded URLs, such as 'https://druttle.ru/wix?keyword=wolfgang+puck+3+cup+rice+cooker+manual', are used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=wolfgang+puck+3+cup+rice+cooker+manual
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/333bef75060e.pdf
    • https://static.s123-cdn-static.com/uploads/4452846/normal_600547d938997.pdf
    • https://cdn-cms.f-static.net/uploads/4403673/normal_60144767c8c87.pdf
    • http://sizijevoji.iblogger.org/braid_game_guide.pdf
    • http://gebajajax.22web.org/printable_reading_comprehension_worksheets_for_4th_graders.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dabatisew/46862405049.pdf
    • http://piwugolixero.epizy.com/sakejaluxewevegomexinu.pdf
    • https://s3.amazonaws.com/podawakumepewez/59228256685.pdf
    • http://rapuxatidugek.epizy.com/abhiman_odia_movie_songs.pdf
    • https://s3.amazonaws.com/sumesawoxajew/alligation_mixture_questions_with_answers.pdf
    • http://pamakejexo.epizy.com/aduana_de_cuba.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/biomedical_waste_management_amendment_rules_2019.pdf
    • http://lowadof.epizy.com/rivezoje.pdf
    • https://s3.amazonaws.com/wixamupelinere/84117297490.pdf
    • https://s3.amazonaws.com/zategafozasiru/xinamenu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001093c.bin
a9a9b5be00ce111e8f862cb69f846022ab7b85e6b8a8fd29612607baf1498c14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 5400 bytes
font_01_sfnt_off00011ba5.bin
09f3ecb8df7500f406af0504ff12cf41f95cccf33cc506a7a1ee3485d5108143
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 10364 bytes