Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5900ae50e34ab1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 04:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fbad1e4a9189b2ad01922de8259062c5 SHA-1: 6745ce9f911edc8b98766a048fd2ff1793da7dfe SHA-256: 9b5900ae50e34ab1e77705daabb71c1acd5445233c1a8551f391fb8a0a2bc4cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://locthanhwindow.com/img_duhoc/files/mejevevapivupaxovud.pdf In PDF document text
    • http://stphilomenaonline.org/userfiles/file/14945127798.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/pakomajiliminozip.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/1864992822.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/29373657676.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/kunugewerizifasaxa.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109030614046692.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/buwab.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/99692816836.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/201b61a7ac17a2c1514d930de789a5e5/71407137961.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/panaposivubowefixopiduxir.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/45460842364.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/15405998137.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/dosusepolepakutiged.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/73290114814.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109031013338354.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/fizevapaguzafi.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bunenefudajubifinixote.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/mumoluwopanobaze.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c46beeb71---15520271464.pdfIn PDF document text
    • https://31app.com/userfiles/file/29655756658.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/99106244481.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/73601539166.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/90281718891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=let+us+worship+tye+tribbett+lyricsPDF 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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 10600 bytes
SHA-256: bc5b8fb0c212bed135f6cb92f8b505925dc1150d2c3e25fa4967d68507d85114
font_02_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 15328 bytes
SHA-256: 909c5e4f9a9717b19d343293745fdfa8687fbcb465be1af39dfacb3686a88ecd