Malicious PDF — malware analysis report

Static analysis result for SHA-256 853cfe3aed1ee8ab…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 18:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2190e4d4a8dbc0f6d2c539cf28fe0c03 SHA-1: fae79e4f4d5792a51ce621060298fc1e667dbbe3 SHA-256: 853cfe3aed1ee8ab361496e8d0ce112d7fa7d858edb81eb12dcc58b79d8d87c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the structure as a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97f4d53ab---barik.pdf In PDF document text
    • http://wjcopy.com/upload/files/lidejolofikedigonugefuz.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/tewotajenokefuretitepowo.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/luregixav.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/zipopadekizavava.pdfIn PDF document text
    • http://langyupharm.com/upload/files/bofunevinawejukefoketuku.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/77299578241.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/93090165190.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/tajogurowokifefewilari.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/26258280524.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/49027603865.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/8176950562.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/78969687190.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9mcpor97usg4l34tcd5c2g5mo3/lirekimowowipasiruxiba.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/xugugixik.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/54428284865.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/98195189049.pdfIn PDF document text
    • http://cartopack.be/Images/file/pelinivodovabexuvanu.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/saxude.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/62835844035.pdfIn PDF document text
    • https://megashina24.ru/files/files/wilaxilusefuzu.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/62940099695.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/71006818154.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/59785647936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nicetas+choniates+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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 20364 bytes
SHA-256: 24ed71cd500fb7c22ab9fe3dc84d8a693cdb748b78b4d9a8ca302a6fdbcdb794
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10548 bytes
SHA-256: d79295cf6335094721ddd2e4622710820c13a86dd586e1682c3d00ca6c971c71
font_02_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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