Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd455b583162c6c…

MALICIOUS

PDF

68.3 KB Created: 2021-09-18 20:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 695e837e912c4f8b636b5a9804969bda SHA-1: 733765ff543f8b61474f35b19bf77a19b47e5327 SHA-256: acd455b583162c6c3ddf9d222781dbc27b448a9441a79e983d805ee8b651b93c
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content. The presence of multiple external URIs and the link farm heuristic suggest a primary goal of directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 4

  • 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=brochill+app+without+watermark+download PDF link annotation
    • https://tjpapigroup3.com/contents/files/33211710558.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/75602333007.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/gidawuramikajeketovubo.pdfIn PDF document text
    • https://petala.gr/userfiles/file/dutadi.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/wogowutuduw.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/tukegujaxapupoxili.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/bonidunupogozegenovuwatot.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/24139754180.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/pinuvafijudogeragur.pdfIn PDF document text
    • http://keyday.ru/files/files/ribojakerek.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/zasozeri.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/zopilamure.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jujotadetenefaxuguxu.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/86343730126.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/nonitojatat.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/23227299075.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/zudidutodebawilejule.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/77352407452.pdfIn PDF document text
    • https://clove7.com/userfiles/file/11875783264.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/77419978892.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/95351028481.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/17328656604.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/rixejabigapubobipabomomu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/75739454203.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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 14388 bytes
SHA-256: 43659e641ae1e128e85d37d9a9de35b43b3bf0a064b65002a57c57b3c0abc50e
font_01_sfnt_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 10940 bytes
SHA-256: 8c610cbd2efaf886fffda0e2eddcd7b7c3924ead14743d8a5722214e96545668

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