Malicious PDF — malware analysis report

Static analysis result for SHA-256 f363ac7ea846fb39…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 15:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0a243c0f3a5c6bd04532748ddd19c6d SHA-1: bca7ad7d5cb71d6c67d29e7257a8c994eae77cd0 SHA-256: f363ac7ea846fb39e924e8951410f2131f5fabea2c4f201f9163a88101a9614d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://detskypohar.cz/upload/file/68745048732.pdf In PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/xebifokuxosofedamabiwavo.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/pofividuzuwu.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tikarikenu.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/nekuziluki.pdfIn PDF document text
    • https://fq.ua/images/file/14377714060.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/zepanufoguvobuxanidusa.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210917172046_2050136775.pdfIn PDF document text
    • http://df-2.de/images/daten/file/gemisita.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/26755986421.pdfIn PDF document text
    • https://reha.bg/content/upload/file/nakatolibeselijad.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/44311026435.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/xerurofavadujag.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/79328262402.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/97799116489.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/dugekadejafodik.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/62368243789.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/xuxiximep.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/pogomivagamapo.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/95428418554.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/82098546973.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3f2936ad28b6e330639d91634fa9bd83/49847534599.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/84727988860.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6bd13bb477d40d3310fae4a980a8eaa3/batefigikedudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=inspiring+words+starting+with+uPDF link annotation
    • 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_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 17316 bytes
SHA-256: 65ccb1cce40d36c9e189f8b304d379e73aa524547b41f6ecf8b38cbccfe3c51c
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 10632 bytes
SHA-256: a6b7a4fa1319de9602472e799d5b424dc9778bd62269ca49752f977093e15720