Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2171291ca4ed6c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-22 23:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 922472441cb7660cbee8679e9f2ef0a3 SHA-1: d50a41191152f8160473a53c96ebfbbba47b6edf SHA-256: fd2171291ca4ed6c42bb95119405fc23c4fbbde7f72fdd9df21118395ec73f0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or content distribution scheme.

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 http://fabrikando.com/cmsimple/images/file/jonewogufa.pdf In PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97649132734.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/29596121199.pdfIn PDF document text
    • http://com123.vn/uploads/file/jotumepi.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/semiruzesedevifetokezafi.pdfIn PDF document text
    • https://avela.md/userfiles/file/82239903333.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908155347479.pdfIn PDF document text
    • http://snsi.jp/image/news_file/25925157557.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bavuroje.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/ganifizefoje.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/66047886280.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/90406421983.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4dab80c9bf0dc477541379058b0a33da/7258176084.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/42434416118.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142b8881db77---kalezexeva.pdfIn PDF document text
    • http://goldmustang.com/files/files/tegaterala.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/jixivaji.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wuvemunakovogi.pdfIn PDF document text
    • https://777mto.com/contents/files/77963907824.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/72152283318.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/lejomukinovekefowatuxepi.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ximimiletuletarakumowo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/6386957940.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/10678466051.pdfIn PDF document text
    • http://slsnn.ru/content/files/4919340090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mobistealth+cracked+apkPDF 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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 17708 bytes
SHA-256: b0f175f99492b020a18c519a69bca5245a179ae824c6c0156152c3a6dd5a4a35
font_02_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 10732 bytes
SHA-256: 4af6a595f997ba63441146dfd0dc94d2ed6e33fab7f55df2eb6cd8dbcbebfdd7