Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e05ff5df28f862…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 07:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9d555f6a648917c1af1d96de21c4754 SHA-1: e635d4eaa3ff41a4899e072c478fd1204f9caba7 SHA-256: 94e05ff5df28f862238424f9d227fbc8a94e1bf61823055dabc82504b7282b41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the attack pattern. No scripts were extracted, but the PDF structure itself is indicative of a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alrabbanoilandgas.com/file/files/28709909406.pdf In PDF document text
    • http://homestationrealty.com/userfiles/files/luwajawako.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/76028943945.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109181059554636.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/3121266129.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/xovesoxetapewukud.pdfIn PDF document text
    • https://andhimazhai.com/images/files/18020136494.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/vugiwifadov.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/diruxupawitubavabekafoma.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/52349378842.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/84817541121.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/zugobufofewuguwakawino.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/boderorazapamigodaxomon.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613134f582ef5---kimubowejowomelop.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/2878770193.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/19884878010.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/rakalu.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/sulan.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/60225550740.pdfIn PDF document text
    • http://snft.ro/media/file/xiwaj.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/nisunazipokudax.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/turugagaxomefotigu.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/6005062849.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/92948336123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+tv+box+freezing+on+startupPDF 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_off0000b6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DE 17636 bytes
SHA-256: df5573c178d459e263b9870c537828584ccfc4dc7de78777df61271fbd214030
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 11076 bytes
SHA-256: 47468396593db91421042c2e9f5c1b389a713e828c54ba6be64090ebe360d83e