Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8d75f071604a3e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 04:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58379d9c5419f049bdc25e7ccd01f320 SHA-1: bd6610acb7c578e89d8e2f95e8a43386a785de37 SHA-256: 1f8d75f071604a3ec85d1acf3574f607710855b76bf5fe40bb21cfa5c24db1e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many of which point to potentially malicious PDF files hosted on disposable domains, suggesting an attempt to redirect users to malicious content. No document body text was extracted, but the presence of embedded JavaScript and the link farm heuristic strongly suggest an attack pattern involving redirection to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://benthanhsgfarm.net/images/uploads/files/59295858689.pdf In PDF document text
    • http://crmloccitanecr.com/campannas/file/74213222499.pdfIn PDF document text
    • http://furniture83.com/upload/files/puzebipetilagigonezifime.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa4e53fa6---dosusuvazole.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/85954230124.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/gebup.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/nijogu.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/63638416914.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/64285928993.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/bipedufun.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/1651543748.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/sibirakomituzikuzalujozu.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/94236882057.pdfIn PDF document text
    • https://themalc.org/files/file/tasonake.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161308f190132e---gifuwo.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/rodowewulavixurasorivu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/22703031394.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/32563093936.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/15/6189240145.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210915141135_611547.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/3267548490.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/mawig.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/76544180948.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/sodubeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+record+video+while+playing+musicPDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 11208 bytes
SHA-256: d29bf38904b46e4a6ff078d37c2ed00eb3c844cacdefe2b077065eb79b8b4572
font_02_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 18448 bytes
SHA-256: 7c961dbae03634e6faaa44c4f07804809a5025fb5598c9075bc0c66df1ee615a