Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ed1cab3eb104c2…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 21:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ece6e246cc2adc566f06c2bcc4596d88 SHA-1: d59631e8cbba90b2bf0d861b1bc8bf8b3449f414 SHA-256: e1ed1cab3eb104c271488079cf3b49d683b281d98d5ab2f799abe61acdfd6737
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chcial.ru/uplcv?utm_term=dokkan+battle+apk+global
    • http://anticacarsulaeborzoi.eu/userfiles/files/85225780466.pdf
    • https://giolog.biz/images/bulk_images/files/gurebisamomixowonaje.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/xedikofilen.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/3251231470.pdf
    • http://bellina.pl/userfiles/file/pefadimode.pdf
    • http://dekobonner.de/userfiles/file/37525193285.pdf
    • http://babyshelter.net/assets/upload/files/63095442712.pdf
    • https://sunnyrosesschool.com/userfiles/file/kusuxut.pdf
    • https://anukulagrotech.com/ci/userfiles/files/43343182626.pdf
    • http://stauarchitetti.eu/userfiles/files/rugasanuwenoworezi.pdf
    • http://lindendirect.com/tempimg/file/88530141512.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/nuvinulobajezo.pdf
    • http://lavalnerina.com/userfiles/file/fuzotexareze.pdf
    • http://ecovn.vn/uploads/news_file/puvexitute.pdf
    • https://lbk-ingatlan.hu/uploads/file/13366487348.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/kozarapijafiwapilodekepus.pdf
    • http://www.companyforte.com/imagenes/editor/file/kewupodulagopifitixi.pdf
    • http://farmaciafasolis.eu/userfiles/files/46786096738.pdf
    • http://imssp.by/data/images/fxeditor/file/93824475440.pdf
    • http://mnarch.it/userfiles/files/64526182146.pdf
    • http://prosquash.by/data/mawelazajisisipeludux.pdf
    • https://e-room.co/userfiles/file/vavanakepijagod.pdf
    • https://starfoil-mail.nl/uploads/wysiwyg/84703020936.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cf.bin
1caaaccfd43555726486367e523a5468e16ecf1d8a4c06092cb7f6ac52ab03d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 10300 bytes
font_01_sfnt_off000108ef.bin
3620844e5b9b12335e36e75f86e29b6a1c419065f2cebe660b4b0c9474478a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 21424 bytes
font_02_sfnt_off000140b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 16792 bytes

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