Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f4da5f71e7f7d8…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 05:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57790e696628d6d436b0f8cbae04ee9b SHA-1: 53c01a90ecc60c591bf9ec48215feaf026bea124 SHA-256: d8f4da5f71e7f7d8c561cf893e0156dd3e33ff72f90c9a8169af51b0de5f5595
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a technique to obscure malicious links within a network of disposable domains, likely to evade detection and distribute phishing content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://binarbaidservices.com/public_html/userfiles/file/nefutakavexeniwer.pdf In PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/vaganemimejufori.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/64501542983.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/49562963398.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/74866571486.pdfIn PDF document text
    • http://actinq.nl/upload/file/sinujenitepinabe.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/fejegobuxivefilewuna.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/gudosebotogesulitapewe.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210919085306.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/tugotofedi.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/56572272820.pdfIn PDF document text
    • http://gaudi.tw/upload/file/97409926472.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631792726.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/burepufemamonitu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/287a7695ee9062652d365920004ff25f/validapezinatigilisamewu.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/gital.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219141411202964.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/61960530211.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/23659991615.pdfIn PDF document text
    • http://isvpro.com/custom/files/35380124044.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/ziseze.pdfIn PDF document text
    • https://tsegypt.com/file/wokitilekefosomapipujo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/vijujejewegedunozetizob.pdfIn PDF document text
    • https://techlan.pl/files/file/27818639083.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/pekel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+bedwars+hacksPDF 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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 17644 bytes
SHA-256: 6ecdee134ae1a592c76816bae278fc89239ba48a47d119ec06bf9558637dccc4
font_02_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 10716 bytes
SHA-256: 5e15ed5949c52e7228271cedb57290700d83f74e26dffb6bd3e82ab289488a5b

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