Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4806de33b8e241b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 01:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5df04fd1dafd29c1753101bf52eec651 SHA-1: 4aa51f6677059d41fd8048e2f32c939e64941d4b SHA-256: a4806de33b8e241b43d5a8403c6a9040fb25bf158e3af82041344b66c6ad9626
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external domains, one of which is a known malicious URL. The document's structure and embedded URIs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=how+to+find+who+searched+me+on+instagram PDF link annotation
    • https://marjoyunlar.com/calisma2/files/uploads/pesane.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/fugudibejajalejuvalejoto.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/80664543628.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ab4qte55dka8joahcppp6p9r0a/20310749336.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/jazoxedov.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/figikefavix.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/84695665179.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/70360211628.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/49425017336.pdfIn PDF document text
    • https://aksusu.com/upload/files/22673722490.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/93022174802.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/48162010345.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/804d8d8747c384a745f2fcd65fe67edb/figiwumifewapitigowuw.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/zawususakokutidiru.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xozedufetiwoderosidizu.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6365432236132f3eaa2c99.pdfIn PDF document text
    • https://t2sc.me/userfiles/55679666080.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/966232551.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/59316652670.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/vujapuxazaridodofejemojep.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/96047206433.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/48334845994.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/52605631868.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/52477325706.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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 10956 bytes
SHA-256: 0b0f672383102a139accee2b8a60e3f03131002faf9d8914735f35a1c9de04a0
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 17460 bytes
SHA-256: 922108cf7ab8d0e5309e66b5e1118b5bb8ed7d5e64d6542a2ffb1f7691327e4e

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