Malicious PDF — malware analysis report

Static analysis result for SHA-256 b370941123197ccd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 21:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 528a9f8660d63ce6bb0762fbf6d52db6 SHA-1: 9d5327ce7681ecb524766a044c48a72b0dedf80a SHA-256: b370941123197ccd6fde3cd59bf5b58e031acbcfa39bfaaead363ec2a1b4422c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tyros-club.de/userfiles/file/14927855750.pdf In PDF document text
    • http://oawebserver.com/piceditor/file/61132457488.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_82308A699C04AFFD.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/diran.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/145358663.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98157196471.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/15888410254.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/91312512235.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/vedemarisomozamoz.pdfIn PDF document text
    • https://granitnet.hu/editor_up/48593807168.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/96448720717.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/votidezuse.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/pojego.pdfIn PDF document text
    • https://rjpexport.com/files/xojalufud.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/18997910486.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-14/20210914102319402020.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xusamosofepe.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/digopulelobejebisalijolop.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/tegoxetaxoxesoran.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/70005704471.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee628d43ba---povoliluxexaropa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tv+box+mod+apkPDF 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_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 17488 bytes
SHA-256: 2a37fc6615fa7ce135afc0f797e8567cc3f0b78fb1f1f81c8adbda8acf0fc6c8
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 10176 bytes
SHA-256: f6bf5a579ba567d320d2acff61cdc5622c66a80d768ac921e59b6d2e3db2564e

Open this report in the interactive analyzer, or submit your own file for analysis.