Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fcf74526ef1047…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 21:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d26f60f16b3977d91460299caeab61f5 SHA-1: 599bd493aebe05dbe0e4a431654020e19fa554ba SHA-256: f8fcf74526ef104716946aabc645f9b535e544f55cbfa1692a08ddd702830d10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic specifically flags it as a link farm. This suggests the document's primary purpose is to redirect users to a network of sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zhizhencn.com/filespath/files/20210904074900.pdf In PDF document text
    • http://handsonmontessoripk.com/userfiles/files/98686308363.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/vasojeforopu.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/66880221986.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/dadutogek.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/tulikanavowovulijo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5970864f3---jubuguliranalezo.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/82071517123.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/lakowi.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/38763829170.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/ferujimo.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/6281407136.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/74973119872.pdfIn PDF document text
    • http://packturf.fr/files/130339569.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109042031409624.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/galitezezimisazabifu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5a4c6285800bf3f4e9273e5e56f70eff/65826642470.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/sopadosavavokozez.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/49884148781.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/38830982222.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/patudomi.pdfIn PDF document text
    • http://kezmosas.hu/files/file/gogato.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/39531191918.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/58592123090.pdfIn PDF document text
    • http://dothi.info/images/files/48108501576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=block+area+code+on+androidPDF 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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 10240 bytes
SHA-256: 8a37da1d62eaa8bab570e4117a5e0e3a862fb2afbdcd57fdca26ccbaf2ebcc9d
font_02_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 16904 bytes
SHA-256: 193ac4000e838d027c8c853feb6b8be9ffbe684d4bf4744e4e9ad1af81f24918