Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af194164fa0dcc8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 08:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9d586bcfac363e0577d676d13afed4b2 SHA-1: 90de7149ff76b6c9c97e93c5f7b28b2018cba426 SHA-256: 5af194164fa0dcc842c891b014aae2c9ea9d7dd68cec4686943823c9479f2b4a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm designed to redirect users. The presence of external URIs and the link farm structure suggest an attempt to direct users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.pattyn360.com/upload/forum/files/woroxosebotovabonefir.pdf In PDF document text
    • http://biplano.eu/userfiles/files/78412836703.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/derexilozaxulafogepo.pdfIn PDF document text
    • http://indemo.pl/Image/files/77523170620.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/99424581709.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/90081952811.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/78946298048.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/49830336686.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/fakavajozufaximid.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/dolulalagibos.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3e664a14043ae2b06e6d7db8fe7c277d/99358220563.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nlh5keitb1ad9m3f9r62cgotjn/60139074804.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/xuxugilidamaxanosenalo.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/pezapesabewawoma.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/51530115285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=forza+street+download+apkPDF 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_off0000c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16452 bytes
SHA-256: 82652f3a8e3d7d951e23253c1af9a299cae2dfb70b856faafe89baac4c6a8288
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10508 bytes
SHA-256: 418cc40e87be5bfce393adaaefb9511d435005dd8a9784f28899d082fce259d5

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