Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ef3a83c4737b4…

MALICIOUS

PDF

68.8 KB Created: 2020-12-15 21:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 30d4499a14cfb0d7c0eb4eebf9acbaa8 SHA-1: 9078a331cca65c509ab1ffa600a431a3ec18c4b3 SHA-256: 753ef3a83c4737b4c8911d5d594d396fe33e2f000a4cac0af50b66904a69f46b
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The heuristic firings indicate the PDF is designed to host a link farm and is flagged as malicious by ML classifiers and ClamAV. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffine.ru/123?utm_term=grants+pass+high+school+registration In PDF document text
    • https://pudisipilusive.weebly.com/uploads/1/3/4/5/134597375/2627194.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/lezinedolipetajonun.pdfIn PDF document text
    • https://rugotegejobaxus.weebly.com/uploads/1/3/4/7/134734811/5469303.pdfIn PDF document text
    • https://sekuruzinof.weebly.com/uploads/1/3/4/8/134897543/kizojitugifi.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/xexiraxu_jazamotixova.pdfIn PDF document text
    • https://ruwaxejitoxa.weebly.com/uploads/1/3/4/9/134902813/vuviwonaranopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/kowazubipozonub.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/28827842293.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/kalukosetinuto.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc654e0affbf90a660f952b/t/5fd656ecd654060362c5fce0/1607882477267/72655111938.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/blue_prism_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/kesavanetonuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/case_study_free_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/xisenubolulasod.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/41703667729.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 5228 bytes
SHA-256: 5a1344b0b467108523c402433bdd2ee0500528aa95b7452d6f0564f8888f8a8d
font_01_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 11136 bytes
SHA-256: c37bec4a41a07982bed0c0e2b4b32ba1fafbf425bbb5f2281e81be24e738aec2

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