Malicious PDF — malware analysis report

Static analysis result for SHA-256 9806743ed31c327d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 04:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a4d3cc8a4c0bd86be484e14c73c7413 SHA-1: ef26fed332c77581d4e8d5a4bc78490c3cbf4694 SHA-256: 9806743ed31c327dd1d6cbbb460fd09ebbf6807ca8815a6dfae5efeb0da29f46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kleinschadenexperte.de/userfiles/file/13794241571.pdf In PDF document text
    • https://twinscooking.nl/twins/userfiles/file/vodemasesubesina.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443054c2338---77006345153.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/wapokevidijude.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/50688682066.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/tojilezoj.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/fokudaxabafemuzavu.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vosesimikel.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/66910815089.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/zakuxijipoxadi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/zaxivifesixopi.pdfIn PDF document text
    • https://tdfstore.it/file/fubabeteruzalisixal.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/30531734784.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/zijenekasuriwajipaliwuk.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/23433379649.pdfIn PDF document text
    • http://belv.ru/userfiles/file/mizoguxawekoxibo.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fikupegimivupajoxurozusu.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/7855024618.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/51367908730.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/99284211129.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/2810653779.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/1679475032.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/50014189599.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/14448600111.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/3460721223.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/gerevekilomaraweziduwuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+app+connect+to+serverPDF 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_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10508 bytes
SHA-256: b195c7005a1c9570c58bc15fc70b89542a41f3b76d7089d0cb21f9f05630c604
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 18056 bytes
SHA-256: e9abced0834ff8f67a6e5add24a9ced1b1798b456324055c1e7b58b5a6349de9
font_02_sfnt_off00012fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1