Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2f9fd8f31709c1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 19:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1e6a0489d6ea2a885d56076acba558f SHA-1: fc993a1309370ed79daf856ad77193531a8bda8e SHA-256: aa2f9fd8f31709c1fb2a7a0036c77cbd38ad0d6d77a0167ecd760cf570237c63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a URL containing 'five+nights+at+freddy%27s+5+apk+free+download', suggesting a lure for potentially unwanted software or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://coretry.ru/uplcv?utm_term=five+nights+at+freddy%27s+5+apk+free+download PDF link annotation
    • http://61kidsclub.com/userfiles/file/77875175134.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109081212332698.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/4988476086.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/84463393974.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/37653378682.pdfIn PDF document text
    • https://badrivishal.com/media/birozukab.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/83224721898.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/36184228884.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/terepo.pdfIn PDF document text
    • https://aromamarketing.md/img/files/71057774290.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/39292811125.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/sekefolesapaxosufofaxefa.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/33869837022.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/19904798488.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bifizovepifavoripoxap.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/midaxusetatimerabu.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/40726113229.pdfIn PDF document text
    • http://acelybio.com/upload/files/24441327062.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/89326077801.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/jizaradolekosoj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c16b1bb395---98396111860.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/99423873067.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 11280 bytes
SHA-256: d6d4bb7c14b5c2a0536353a23e1207ff1066e4e66a455da3c8084316d3b9fb0b
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 18560 bytes
SHA-256: 880eadbe6787a338c47f976544e7bd50dbe7dc5a45122900ad34b6cadcad6797
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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