Malicious PDF — malware analysis report

Static analysis result for SHA-256 7565b21b48e865b4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 04:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3ecc84ab06cdc01630ad4be8bc31639 SHA-1: 873ee27cad3bb741d8589559a45162d84d5a4b16 SHA-256: 7565b21b48e865b4807b079973862508ee4750d7b5848d324ba3112a8db89d34
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rcot.by/pics/files/8251601997.pdf In PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/99216842318.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/napelatodukete.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/kojonunutaje.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/jububufevukuxasevuw.pdfIn PDF document text
    • http://med-os.com/user_upload/file/91425829805.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dedixixavajubaj.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/14138877861.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/kujofoferix.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/sitasalor.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/66341786948.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/50836605888.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906051830.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/zajofurenevusod.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bewaseperoto.pdfIn PDF document text
    • https://jurad.eu/files/file/dokumofusazatovu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/39856183592.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109031959125243.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/89834544336.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6ep5djjmchj3b08t16s8pbd6oq/24382780047.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/xodufado.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/2406904410.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/30975140040.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/27743895097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=reset+app+preferencesPDF 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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 10260 bytes
SHA-256: a570acd17022a6ca4813b404e4792f980d113ed77ff1f08826eda21f172e7cbe
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 18224 bytes
SHA-256: 72e7d9a17daab2b77fb50018ae975e1fb5efe8c3deb6c1fded285a0d318a5b18
font_02_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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