Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efe0b4733ae7a60…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 13:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e43605d62e281e874ecd3f1efaa9bc3 SHA-1: 39f01a695ce456ce033d50f77b6dd26ec62273c4 SHA-256: 9efe0b4733ae7a608b96ef152d416bacf5dd9bd58785e0eec8cb9d5e7e33afbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or SEO abuse. While no explicit script was found, the PDF structure and the presence of many external links indicate a malicious intent to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://alessandrobelleseveterinario.eu/userfiles/files/6626357384.pdf In PDF document text
    • https://istanajp.net/contents/files/46760512557.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/sivuwaseledisodivapagatiz.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/83441572488.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/4204513145.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jatevilixuromejuvodozal.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/gekadagi.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/97823156155.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/vabotuwiku.pdfIn PDF document text
    • https://digireg.cz/upload/busamudokomonu.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/39690116491.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/xevigopifejexab.pdfIn PDF document text
    • http://splogservice.ru/content/files/58161495214.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/8057104300.pdfIn PDF document text
    • http://planetamama.ru/files/file/58325767001.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/wamuboduto.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/80228950122.pdfIn PDF document text
    • http://ch-yang.com/upload/files/kedir.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/21368070925.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/gosipajazarisimafuzadaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=senior+android+developer+interview+questionsPDF link annotation
    • 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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 10860 bytes
SHA-256: c5f75125caf95af5c70b7e92aa44105d8b1e12a2c5a40a093ccb4f9fcf94cd64
font_02_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 18152 bytes
SHA-256: cecf98bd8ec9065997b64a2bf1ba7649adae3b4b9c6b31a1a2d830f31e88a93b

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