Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e95657f212dbb9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 00:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c89edb6c7b1f920881369a74c77b9915 SHA-1: ae2e118969d8103422c5435b0ae64edb7bc0a9ee SHA-256: b9e95657f212dbb9c6ec0ad841df1dd60cc1680cea70e68c0a09fbb98998ab42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=how+to+transfer+data+from+mobile+to+laptop PDF link annotation
    • http://www.moyekolodin.com/files/87231042921.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/rumizakuzimune.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/futarixewiwafulomijuji.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/77592991462.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/12099253218.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/movixaxukuzilixu.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/13608813749.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6a0be885---wafinejetozuperal.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/83382574581.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/68515085029.pdfIn PDF document text
    • http://timebymtm.com/upload/files/60908258939.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jalatijibimejuweneko.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/nadenovurojeviguloxeribu.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/34257527107.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/23443714735.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/rudevuzib.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/lawexizez.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/23970586904.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/45178832643.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7tk6jdgrab27jkial516f7ld90/80781440022.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/92070137901.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/5333219943.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/12402693626.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/16783128522.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/44918179520.pdfIn PDF document text
    • 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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 17648 bytes
SHA-256: cd648a709e285813db2cf4eb0f82a671177a8a83fdfaaae4f8045e491c9a8ee1
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 10876 bytes
SHA-256: 5830b45de69db94395d3d44be0d75c9a4d13428e26a809070725ae71278beee8
font_02_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1