Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bab995bb7379ff9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 06:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1355d38926130ed8803cc1a73da34d9b SHA-1: 5a6fa4f4370bfc158eab642bdb9991c4f68ad15b SHA-256: 8bab995bb7379ff9948fa60f197020c7b19ebd2498ee31ff5530dc153b2d9cf3
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://scvumaichiramen.com/uploads/files/68047113985.pdf In PDF document text
    • https://membermimpi.com/contents/files/zinonepadidutevamas.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/dosakakoko.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/526861c1ad8f680e976b873059518011/31966481332.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/futaludilurovi.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/69153965271.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/63260300648.pdfIn PDF document text
    • http://24cvety.ru/upload/files/23922001299.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/73516775603.pdfIn PDF document text
    • https://rotitelor.com/contents/files/wuwifejamelobefafogovi.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/76623328814.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/fuvijojafegenapigub.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/resezo.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100553153348.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210911154700.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/61001752470.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba9953de68---diwusopaza.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/korutameji.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/95507539634.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/85344092246.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/74283884854.pdfIn PDF document text
    • http://inistor.com/ufiles/files/wenuwezibowokuga.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/mekadipezupewa.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021091301021773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=update+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_off0000b756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB756 16808 bytes
SHA-256: 94f17c54f2f127106b389c8915ad14151da1219cd5bb07272eb104ae39109881
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10140 bytes
SHA-256: cfbd39074e003413ce712f20eaa5bd61889075294676120354791cfd4d498172