Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f8fe905df29138…

MALICIOUS

PDF

67.3 KB Created: 2021-09-24 17:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17f67938995bae755b2ce0dcfed8c7bb SHA-1: aaa5bdea4a601e4b2578e89826dfb7980058d21c SHA-256: e0f8fe905df2913841a74c05c2ca3ba21c12cbce307400649c95f99a14b2b79d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is identified as a phishing lure due to its image-only nature and clickable action. It redirects to external URLs hosted on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=pubg+new+state+beta+ios PDF link annotation
    • https://kindeeyudee.com/ck_files/files/resadafedu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///62613178370.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/75501733472.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/29822553829.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/33722388474.pdfIn PDF document text
    • https://venus-forever.com/image/files/widofivajodivaw.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/15505752666.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/85629288281.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pularonugetenep.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210921_A1804DFD98AED3A9.pdfIn PDF document text
    • http://vodnik48.ru/content/file/88433293750.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/091606343326.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/gatepiniduro.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/gimilivitivenanobo.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/wenusuvir.pdfIn PDF document text
    • http://teraval.cz/res/file/1197017328.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/15012078571.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/30601801331.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109102117359399.pdfIn PDF document text
    • https://endobible.com/userfiles/file/lusaxixujulipilu.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/bomixopovudeseg.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b125ec43fa---43530433705.pdfIn PDF document text
    • http://bdnchem.com/upload/files/15397814567.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_off0000ac2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2B 10464 bytes
SHA-256: c22c8da7a09ffc98359a08ec615cb1282793ac794cbaa4f017e140aaaecdb286
font_01_sfnt_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 14252 bytes
SHA-256: 5cca5e69179224f893a11fb9371d7ed23053fc7e1559d8c2593c42425d88429e
font_02_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1