Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbeb1f1683981f2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 09:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25a81b9997c671562ae2ce1db15bc853 SHA-1: 9ee6e8c45d8ef0119b513f1769b8cc7034476cb5 SHA-256: abbeb1f1683981f289d3dcc6b5f76a1b35b283036b1c397f9ac2f43a906d709c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various PDF files hosted on potentially disposable domains, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or SEO-based malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://geotersrl.it/file/vesetewaxodixuro.pdf In PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xidisev.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/rebegun.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/22043715655.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/8793220888.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/92966478542.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/10762663413.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/99832217721.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/71887061236.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/tilelaveb.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tidimisode.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d058a435c2---39730974942.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/20294882974.pdfIn PDF document text
    • https://dyaa.club/uploads/file/72657391026.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/78925719146.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/lulasirazugufanaxewus.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/46587985085.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/75800511592.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/jabapidizofeduduz.pdfIn PDF document text
    • http://besteva.com/upload/files/tutideraletowevi.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/92249307292.pdfIn PDF document text
    • http://davcpundri.com/css/file/nukisajakarunebesem.pdfIn PDF document text
    • http://chenruichem.com/upload/files/46605200376.pdfIn PDF document text
    • https://websbag.com/uploads/files/29180281093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=yes+we+can+3+student+book+pdfPDF 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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 18540 bytes
SHA-256: 9256661fc3f7139d2e110fda85b68db9869812f163874ef4f7a43ba738da5f6c
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 10948 bytes
SHA-256: 45740d6af394e821efaee9aa278372156063d6e6c7b3d101fd2120af5e5e4970