Malicious PDF — malware analysis report

Static analysis result for SHA-256 debd632e65f456a4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 07:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1198fc2834925ef541b4db35dd65f78e SHA-1: b3869d98c96142d2c4a456956e18a5fe7447833f SHA-256: debd632e65f456a4ba63ac2eeb017bb33f694f55594acb3d4748e7fdb1aae2ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external PDF files on suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The file's structure and the presence of many distinct hosts for linked PDFs align with techniques used to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4fb7ed2ac---fukuxudowawarituwe.pdf In PDF document text
    • http://tetrafluoro.com/upload/files/41804636535.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/80343819763.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bunorupawozotelovo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/kapisoxodafabamesevizu.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/zosanasirego.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/gifasigubevimubewaz.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/sukujonunazuzotejedegiw.pdfIn PDF document text
    • https://laser123.com/geektic/files/2413107677.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/74612134652.pdfIn PDF document text
    • http://donghotam.com/luutru/files/nowugiliwufopup.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a88f913f1d6c14255e6e4149e6ea5946/lotabifapobifobifi.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/keboxinizexotuzelipu.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/12634565436.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/zusisupol.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210910171156.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/botamujami.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/66433161371.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/samiledudabuwifedupema.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/37247382302.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/10564816686.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/93087099491.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/14376233548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=luna+lovegood+glasses+emojiPDF 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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 19508 bytes
SHA-256: edf3257faf79fcc0e39990e4dd7d7bc193a4ae1632dc5d67077982a7d8f5f5ed
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 10648 bytes
SHA-256: a4b98e5cf98e86f2538e19492dbbe82cf59a81cbeee51c979bc8ed5775ab218c
font_02_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1