Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72563c42439bdb8…

MALICIOUS

PDF

72.7 KB Created: 2020-11-21 11:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b34fd9bd8524272836699cd78000230 SHA-1: 7b367860148eedcb7e65bba9c29915471689789a SHA-256: c72563c42439bdb8d3688ca3ada62a0899f913ed4397ca9b50dc6994593a9eb7
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on services like Weebly and Strikingly. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely an attempt to manipulate search engine results or direct users to malicious content. The presence of a link to a known malicious redirector further supports a phishing or malware distribution intent. No scripts were extracted, but the sheer volume of links suggests a coordinated effort to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/aws?utm_term=algebraic+expressions+definition+pdf
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/0448d72bdf418a7.pdf
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f96b9c618047.pdf
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/3850104.pdf
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/7207615.pdf
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/mowumuzew-novezanoxizoj.pdf
    • https://cdn-cms.f-static.net/uploads/4463262/normal_5fb7ab537da2e.pdf
    • https://jazekidifa.weebly.com/uploads/1/3/4/5/134597150/4cd65fd5b.pdf
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8a1c4dcecb4.pdf
    • https://cdn-cms.f-static.net/uploads/4412408/normal_5f96542969a3b.pdf
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/razinemep_duvakitedikaz_wibenex_ferid.pdf
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f895e034dbad.pdf
    • https://cdn-cms.f-static.net/uploads/4414161/normal_5fb58f4f6b636.pdf
    • https://sijazeresivex.weebly.com/uploads/1/3/4/5/134502522/70320cac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/166f8f80-dee9-41f6-b236-22be460b8ed2/vovawigatiwowirur.pdf
    • https://s3.amazonaws.com/genedesowul/11489948303.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://scripts.sil.org/OFL
    • 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_off0000c968.bin
da57c6b18b94507d1e0f3115651f455ee7964f4c2f2c230740151fcd7ba1b3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 5520 bytes
font_01_sfnt_off0000dc42.bin
a5639f73c72c515150a2d2159adbd0ea3aaa58cbc6193e7fa16e93417dd67630		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 10492 bytes
font_02_sfnt_off0001008d.bin
2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 16096 bytes

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