Malicious PDF — malware analysis report

Static analysis result for SHA-256 7642c3009fb1d282…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 16:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69981aa7f2f1e94d967856a8092ddccd SHA-1: 4a3dd4d72ec6e64bbe1012a924823ba6350b1e95 SHA-256: 7642c3009fb1d2825dd1b3171c22c562d4a2b2d14029921f7160625a92b4cc96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://growyourmoney.in/userfiles/files/17664014146.pdf In PDF document text
    • http://vsrru.ru/userfiles/file/vutebif.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/39224920553.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musakejufibinitakizosoji.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jopuj.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/16115265875.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/76251089705.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161372baaaabae---kagerabaw.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/mofomokawulodomugovibusun.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://hakanhurdacilik.com/userfiles/file/puserawo.pdfIn PDF document text
    • https://nexusmediation.nl/files/ginabixurigenevejakube.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/11376503235.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081522374497.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/12446444778.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/xifazenexozowurodofe.pdfIn PDF document text
    • http://888chji.com/userfiles/files/getup.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/98cc42d45976334bb8701494f94dadd5/dopiriba.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/2546474999.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/ximasalufozufigidu.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/pogiro.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/42832064512.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/68067918143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=conservation+of+mass+and+energy+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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 11008 bytes
SHA-256: edce66a641f5c29af94797a665a7b592e40d9d68c044637550df690b0bf21392
font_01_sfnt_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 17796 bytes
SHA-256: 7767d8d85277e3e13ff2a2b6b18510802439c668f1cc8cf1180db38784c1cbe3
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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