Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d0c6eb0d981696…

MALICIOUS

PDF

74.8 KB Created: 2022-06-03 14:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: abc0bfbfa2340fce3e738b56cdfe0490 SHA-1: 8be539a39640ed84264f7816ddae6090b0fa2c26 SHA-256: 99d0c6eb0d981696cae81baa2d60d81dd7ed3b5b4de35624f83b2bda64a752a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, with a significant number pointing to potentially malicious domains like 'wirut.co.za' and 'ndgai.com', suggesting a link farm or redirection strategy. The PDF structure and heuristic firings indicate an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wirut.co.za/YmrXLWy8?keyword=cambridge%20practice%20test%20for%20pet%20pdf%20%20pdf%20reader
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/33eo8jnmsavkkugbu6nef2til4/51790139309.pdf
    • https://jiketajaw.weebly.com/uploads/1/3/4/4/134464131/tesavejumibakivon.pdf
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/furidiwimejadadi.pdf
    • http://nusratali.com/userfiles/files/46110123533.pdf
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/liladizufo.pdf
    • https://bopuzavupuli.weebly.com/uploads/1/4/1/2/141255413/teditogafelutopalo.pdf
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/1599968.pdf
    • https://fivetc.vn/uploads/files/6235261871.pdf
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/c470e39.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/gekaluda.pdf
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/xiradikale-murav.pdf
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/4560407.pdf
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/pelidupuroxawisiroza.pdf
    • http://www.iccet.org.tr/kcfinder/upload/files/37527696546.pdf
    • https://napalepagosokij.weebly.com/uploads/1/4/1/2/141291079/12f3b.pdf
    • https://xizulewuzaboguw.weebly.com/uploads/1/4/1/7/141783728/dalinawukigod-werolabi-gagenovowiv-nonusago.pdf
    • https://rovilareweledif.weebly.com/uploads/1/3/4/7/134722573/gogesumijodugunusasu.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/batavujatukil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb9f.bin
4e8141865e0301a44651ee6cb00ef9ab5f61191e1636c6472ee55450ad896a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9F 10984 bytes
font_01_sfnt_off0000d4bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 16792 bytes
font_02_sfnt_off0000ecd1.bin
1208a4e160e2e35bc4053bac4b09918eb858d00975fd0125747690ef7c20e01d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 18760 bytes

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