Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4e4ce4f67d5d85…

MALICIOUS

PDF

91.0 KB Created: 2021-09-08 17:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2ac2d0a64b7063ecde7edf24d380327 SHA-1: 1880761df630d701c6324049fa11c72080592ebd SHA-256: 0b4e4ce4f67d5d85cad7619783c1a940f5e8b427a98decad941c893004cd01fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to redirect users to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://guijek.com/userfiles/file/17936417776.pdf In PDF document text
    • http://architettosirocco.it/userfiles/files/divolivibabadurifas.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/66544290645.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/81315666494.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/37343504938.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fatugefixeb.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109070228211115023jkwn.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630696224.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/32498996456.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/61162559348.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/57217465501.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76553170061.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53747639682.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/16590425087.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/66784656485.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/33616138090.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/2577620593.pdfIn PDF document text
    • http://trieuduong.com/images/Download/zevuxawozagimudokir.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323cfd4d860---5078168358.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/12476162934.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/mivotosofe.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/rirenanunerefikedugi.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zutevoxasizefagisinopebo.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/48341967273.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/69974066699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mongodb+full+tutorial+pdfPDF 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_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 10608 bytes
SHA-256: 10dd21c5d788e5bcea9eaf9f04123c11eebcadd39732e388eb7c8f8aaa7f0440
font_02_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 19324 bytes
SHA-256: d24c24a56936dadc510298d0c5b20245c83a6e4ca02be4258b043b6cfa79dc4b