Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d045ed6880e575…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 09:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e008df013234bf324b45e626d6fe174 SHA-1: 89a65be2e139387a9d6713902721e8f3ad5388aa SHA-256: d9d045ed6880e575b1441671176a20ecade70654bdb17025d4497018140a5449
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users through a series of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ddu-hk.cz/ckfinder/userfiles/files/rawukumifojuxujasot.pdf In PDF document text
    • http://hvpeds.com/upload/contents/file/82299776853.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/6363325267.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/tejawalifufeg.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26918104449.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/70243996597.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134054d86452---nokagopebidogefakiz.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/leduxosebepavelitezofew.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/bugedugopibilerewule.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_1D381622C919BB33.pdfIn PDF document text
    • https://yodobashi-church.com/zaradazazisi.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/67594427967.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/devudokotas.pdfIn PDF document text
    • http://scpt.it/userfiles/files/48583802919.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/46730856645.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/zibexixidobilu.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/namosadazonudamufomoriz.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tugekulugekuvifukejel.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/24714042774.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/mufozoxinap.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/romevivibimesunudot.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/miwuvex.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/rotakigomokexika.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/89253823849.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/24256181331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=connotation+in+the+ravenPDF 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_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10088 bytes
SHA-256: 6c8e781380fdc8a22009cceff9361c4646ab905a72aa1b0b516e0b606c92e874
font_01_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 17432 bytes
SHA-256: 520f6f562c36f78d934520051bc85ffde745aa104f512cc5e3e066f86eaf8e28
font_02_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1