Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d283c44ecd50b8…

MALICIOUS

PDF

94.8 KB Created: 2021-09-11 03:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf5212f51ad7e950bd6013c6b2de3ae2 SHA-1: a0b85f745fea0530bdacfca60fc8b12b1614b1c0 SHA-256: f2d283c44ecd50b8dfcaeddfc42b10bf353ba9147eff83a046e0b59eede913d0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://encino.kopanramen.com/uploads/files/85905555941.pdf In PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/55657829051.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/sezikelaka.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_124412.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22470404447.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zapabeb.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/2237427028.pdfIn PDF document text
    • https://buyafranchise.org/files/files/tinadumaxatukozibubuti.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/47297096764.pdfIn PDF document text
    • http://mega.kz/media/upload/files/sekigoseje.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/mifaxif.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/dobemutijalugirelusiwo.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/zodumuzapozesutanarap.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/kisibagu.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/zopepixamumijoreseredo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161387e4d4cf38---76916450072.pdfIn PDF document text
    • https://alohasafaris.com/files/feterimebobusuw.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/xemidolipo.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/jasilagute.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/47746897289.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210908105750.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c21cdff28---58954841210.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/89315403886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=old+bollywood+movies+2000PDF 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_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 10620 bytes
SHA-256: 2f1aafe4eb0ee5e55fa06ab6b6d1b37dd3f06dd3ddb29a12f6b86ce97a37c7ee
font_02_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 18684 bytes
SHA-256: 862dcef413110ce6abc48990ebf8e49701bf9ed6081572399cc236a53fce3e6d