Malicious PDF — malware analysis report

Static analysis result for SHA-256 84340512a39f95cb…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 03:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3db602bd2a8da2efd9eec2b87eb3b70a SHA-1: 18e539e23e173f4338a0601ebc3a2890aeceb510 SHA-256: 84340512a39f95cb48a4af034869d75e9f3382615c64b5074c6197ec2fbe603b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards exploitation of vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=unity+sign+android+app PDF link annotation
    • https://sabunwangi.com/contents/files/89960444708.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/kelukipurapofitabo.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/sekufenevifotewotoropebum.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/62530367416.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/xenelisaxetusonipagesak.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/66690500143.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7f29fa7f5323303898fc97ad564a4dc2/24387029085.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/xizavaxubaxixukufadela.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/31952393227.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/38118361713.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/16541271906.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/jewenesani.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/18189285717.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/zajosavirop.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/sufeb.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161457c909a16e---71159652251.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/58093571412.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/rijuzokenexaweroxoxulofuj.pdfIn PDF document text
    • http://trubaopt.ru/content/file/70267185958.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/55912302689.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/95316534426.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/16748429907.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_off0000af3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3E 10512 bytes
SHA-256: 5b3141701609319b157a4d767538a0d1e1821f7f5316d9b90988f3f382ddd676
font_01_sfnt_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 14732 bytes
SHA-256: ff317305b3498c71a3264380413fbb0397bf6b1b0a39e2575d8c796e2239b5f5
font_02_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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