Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8183b780d8639f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 00:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 220a4da12cf4b9e8ed0ebed48a1979f8 SHA-1: aa0cdbd6515635cfcea4fca02351043b4ed850d5 SHA-256: 7e8183b780d8639fdbe22b3abcab10a0ae2a0f4976446d7099764a2bc126e7b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or content-luring campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful 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 https://laborke.ru/uplcv?utm_term=10+most+livable+cities+in+the+world PDF link annotation
    • http://austria-ex.com/images/blog/file/feraxaji.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/tusabaposaxonugo.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/57341910258.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/guxunavumavax.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/supazara.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/kawaluwekapenuxabedebogek.pdfIn PDF document text
    • http://birdwatching.sk/media/file/62323457103.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/79606472665.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137717b47f8f---bozekogafevediwi.pdfIn PDF document text
    • http://kisito.com/userfiles/file/57787107044.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210918161635.pdfIn PDF document text
    • https://biomisszio.hu/tmp/30274357019.pdfIn PDF document text
    • http://all-premium.com/user_file/files/54781290700.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/17394701289.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/jiret.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/27507748411.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/fezujavaxubaxane.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/voneki.pdfIn PDF document text
    • http://tid.vn/upload/files/pagedefujiv.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c217b47aed4d51532cbe7f60fcbf2de0/5147858340.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/wogewovifobokixijabad.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/47979081527.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jovob.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210912171807258.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 11004 bytes
SHA-256: 826bb50c92d893bff852603f85225fe445ec3351123ced06c5ccf42ccb84c4d7
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 18076 bytes
SHA-256: 381871d80d1e969acb77c76b7c4b2f724da19e2ea8868e8e2e75c7da0173235c
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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