Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad3d5a42c3984de…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 10:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0a5657381815a7e18a637af5bcfb37c SHA-1: 0abeb5367ef4d291fea30b8196f0435ba520b2e7 SHA-256: cad3d5a42c3984de044355103715adc5eb74575acdeaa527dcf3c47ad5f92d13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external links and the nature of the detection point towards an attack pattern involving directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gps-tw.com/CKEdit/upload/files/nejit.pdf In PDF document text
    • http://progfin.pl/userfiles/file/75947609161.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/bitopo.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/20009911809.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133118c0b36a---figukasebagasufekemew.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/gevejupovamo.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/74976100633.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/nedirakatix.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/norevijafalaf.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/totefipiwajovuloza.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/dunajulafasujuwowi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090512260473499.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/kenurep.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/35175696280.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/jorezitebagedojiw.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/17702016910.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/dajagofowufapibuxe.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/33256144724.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd4422d0b---61153191719.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/95015273791.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/wanosoxonireduzesuwunap.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/gizejusobukugiwiloriviles.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/paruketolifisisel.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/3240140616.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/wepoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=puzzle+games+download+for+pc+windows+7PDF 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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 11160 bytes
SHA-256: 9e05a288fe7d8257dcee5eb5caae871cdc0823cad442ad885e0989bdb26a9a24
font_02_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 14356 bytes
SHA-256: 198806c58cc959361a5a96513c4f9c19f3ffcd2b888ad8026aa5ce6dd56170c8