Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c886b150f6d2eea…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 04:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2292911a71456ce80c1bdc9eaf373283 SHA-1: e86b23f2eb7e43fb34848044f8b2ebcb59bc8db7 SHA-256: 9c886b150f6d2eea55e4cdfc1d0260a986fccd877ef5b834c5cc7938a044b140
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior, suggesting the document's purpose is to direct users to potentially harmful content hosted on these domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://debsecond.net/UserFiles/File/79401855930.pdf In PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/pedaluluvaz.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/91366027544.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/72013737801.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/97632179290.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vepoxuzeredirojakinu.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/neramubujawawo.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/lavelogurelelomivugifoxon.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/nevasavukaxesonowutezijav.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/22449482288.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/pikoferakeselari.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rigon.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/6705923458.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/rudoj.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/80961014472.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613773fb8d525---82510308183.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/36553030451.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/25642192955.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/namomomoloxanezolo.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/55430226579.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/74850194413.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/xikigenuxemurupodazama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=drag+racing+android+appsPDF 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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 17588 bytes
SHA-256: d494b227f2e2d650dee8d9fb141932798f0e57bfe9765c7b0ec65c7c5bd403c1
font_01_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 10412 bytes
SHA-256: 6abc844cb3bb59bb39b92be16371e73db7859c105a72298872aa01eb12ec208b
font_02_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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