Malicious PDF — malware analysis report

Static analysis result for SHA-256 138b94f9630be2a1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 10:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce46c2a302779b822c9b2f50bd9ddc7e SHA-1: ad5ec48b23ae7115a698cffd2e31d3c996a6e007 SHA-256: 138b94f9630be2a1d2547f50ccb262d42e46da897c82cf22823f11d640c6ee51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=download+xbox+one+emulator+apk PDF link annotation
    • https://elminhaj.org/userfiles/file/muxixuvepovagigem.pdfIn PDF document text
    • http://sbairs.com/datas/files/naxijokotan.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905180225.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/nanoneripixoroduno.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/jagulibumirowisitaso.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/notogixolab.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/mososonodudewekawewonobo.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/14481114569.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/ramefa.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/58538121399.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/79051024005.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161404809135cb---58741861064.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/xoditaj.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/kobegutuminoliji.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/60909986683.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/10548638231.pdfIn PDF document text
    • http://aa-nusd.jp/mapisuwiparadaxexozovip.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/19980588690.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/fotumojetagixikol.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/10432744032.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/vipime.pdfIn PDF document text
    • https://bak.vn/upload/files/21588535481.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/lusokotavovelijoxajonejof.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zexavifodeto.pdfIn PDF document text
    • 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10816 bytes
SHA-256: 96271e219e9d5ba26245510acd5025e349ca663baf58a22aef7e2813c15df273
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 18064 bytes
SHA-256: 7e941d13f023bade0a977bb8b19ad8d7234088da4b24401fbd3bc14c75ccea72
font_02_sfnt_off00012b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1