Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e80780caaebb168…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 22:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e3b0a4d8d112f03129190c830886b41 SHA-1: e49506d212df5dc632f70e8787f18614b3875164 SHA-256: 9e80780caaebb168757bb1dbe942877eef32beabf55f29e86c51ba32e880721d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggests an attempt to redirect users to malicious sites or download further payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=vlc+pro+apk+free+download PDF link annotation
    • https://groupekineconcept.com/userfiles/file/guwoma.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143678f80488---57834102801.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/70188897156.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/45952285539.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/80352768378.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/pimonanabusur.pdfIn PDF document text
    • https://jobtiara.com/files/files/87886020498.pdfIn PDF document text
    • http://mayjack.com/upload/files/jizubuje.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/petogul.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/zowuvetidozujozekaso.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/16835409309.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/nizulixubimuvivaxot.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/85477556876.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bc09145b---niporonakilibibolebir.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/xemopalagalutipaxobife.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/gudobipijupuwad.pdfIn PDF document text
    • http://ned.ru/uploads/files/dijidirepolikibalo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/kawatapeviwotolaveleru.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/dulezeg.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/50336648036.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/lagade.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/11704369798.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_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 18572 bytes
SHA-256: 25bb2dfa8e00bab58ed8cbd2e7059eb70e219f0709c56f13cdc824b75f61d4eb
font_01_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 10400 bytes
SHA-256: c5dd9a7d7308ad36226f16c9fca7008183afbac44a3250065b8a75d7ad3b7455

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