Malicious PDF — malware analysis report

Static analysis result for SHA-256 e370ce0fed88339f…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 07:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a2e09b893afbe15ecbbdac5f6327dc6 SHA-1: 926a89d08ea11eec0112c0264cdce976e4d72d92 SHA-256: e370ce0fed88339fe4bc1d62099dae2eee4ecaeda064bc0e3d699c346c48a726
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bsa.by/ckfinder/userfiles/files/jabedi.pdf In PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/38144220047.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/99298832799.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f395182c85---10576423738.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/gososet.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/nesumizulelewiro.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/vitaleregaga.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/fasujisesi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/13809588592.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/94678759436.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_68E423C377483399.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c70b48b1f---sisemadadusaviluximu.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/70492122493.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/levegel.pdfIn PDF document text
    • https://naves.cz/res/file/2217679462.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/zamukagotizurewoxa.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/lapajoj.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/40469510758.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/18002790363.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wonasonegakebudiledebe.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/96689049014.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xiraxiwaronolavimupimi.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/57682029161.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vidibuwelibijumeporusa.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/luzimiki.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/55874060119.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/67468221062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=starred+contacts+androidPDF 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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 10392 bytes
SHA-256: c01454ecadd95ccc8ff200d2da8e1e51a5639622d91c57f64af8d8516635265f
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 19852 bytes
SHA-256: ec568d5f376277d2c41be3c948f8da304888f0be6c3667f8511e127e64916d71