Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a0516d87c899b2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 15:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 751b75069e7a738059079a4de5bcaf4e SHA-1: 4fd8f63e8b393ffe3a129fb4848996baade550f3 SHA-256: 78a0516d87c899b2f529d18e9c48408b03ecf664d9badcece8e0d4de23ca5c29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to lure users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=exercises+passive+voice+worksheet PDF link annotation
    • http://blccy.com/userfiles/files/tisesugaxe.pdfIn PDF document text
    • http://esejsc.com/upload/files/relebufebapekaxukegiluve.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/gobabujabib.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/60123614342.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/besarubotejusexix.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/zajov.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8fe051751---lokoporusu.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/82238052145.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/40568783141.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/3129733504.pdfIn PDF document text
    • http://alltechsro.cz/files/23017740185.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lukejip.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/6458025212.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/tifajoretavof.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/vakuworisagulaxegupimup.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/18426005770.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/49482573662.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907114811.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/vamufuzefezemamijutix.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f7f3c92c1ab60908e512af373d931c38/fenabalewujuwek.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vijujozukuravexekofa.pdfIn PDF document text
    • http://trubaopt.ru/content/file/wuwujetikanumatug.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/92462814686.pdfIn PDF document text
    • http://anpo.vn/upload/files/maralagikaxeduse.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/wubokeritivurewiwewune.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_off0000bcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF8 16348 bytes
SHA-256: b054cbb70c17ed5d1eaccfe2d0ef6fec000ab1950b9ce3c66c19f6d34ca9b04b
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10648 bytes
SHA-256: 44035f79c8a4512718333d10e3cd6514ed6b8f5a264d5a0537ac2cc831207638

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