Malicious PDF — malware analysis report

Static analysis result for SHA-256 540515c06eaa4103…

MALICIOUS

PDF

67.0 KB Created: 2021-01-06 20:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e85df838d00fee702fa1332deac688 SHA-1: dec9c1bc1539e6e17255b83c341dc12866e97784 SHA-256: 540515c06eaa4103fd040842f1803a767266eadc40eca5bcd6d3fda6354352da
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to link farms and redirectors, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious 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://traffmen.ru/123?utm_term=lytle+creek+ca+camping
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/5833670.pdf
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5fd0aba677cba.pdf
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/98a9b2ebb.pdf
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5fbbae521d27e.pdf
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/razekerij_nipisazo_wamuvota.pdf
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5fef024a50c93.pdf
    • https://cdn-cms.f-static.net/uploads/4382778/normal_5f93e85607131.pdf
    • https://cdn.sqhk.co/rifokinimito/cjgshiH/wizz_air_stock_nyse.pdf
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/2096477.pdf
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fa5f60b519c1.pdf
    • https://static.s123-cdn-static.com/uploads/4369504/normal_5fd08864bab0e.pdf
    • https://pubokimaxo.weebly.com/uploads/1/3/4/7/134710154/zafebinizu.pdf
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/00df8d3b31.pdf
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5fe14c5d522b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sajatesawodiji/pygmalion_literary_elements_worksheet_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0e.bin
8bc722747c0795b8c706992d9ea336f899a80c35f2070f6ca4f587b146d15c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 5180 bytes
font_01_sfnt_off0000dcaf.bin
a12095906a0ae9fec08bdb9660030ae50a8e2b0e13a0a26f0a9cec52b2995134		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10140 bytes

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