Malicious PDF — malware analysis report

Static analysis result for SHA-256 f545ae32924091a0…

MALICIOUS

PDF

69.6 KB Created: 2020-12-15 15:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dac91020b53f063cd4c8cf2bce116fbe SHA-1: 1134c92a985feef0b4c92a49e980401e63ab0cf2 SHA-256: f545ae32924091a083f765f73a56c713e4856b046da9ee3e795b690c030561c8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to lure users to external, potentially harmful, sites.

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://traffmen.ru/strik?utm_term=analytical+hierarchy+process+in+project+management In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5f96f137581d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f920d1bf115e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_5fa745b3a1476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8d98a21a95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f9a18d6ec710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fa0483c8081d.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/801ac33.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/297d5f2.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/3957504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_5fd83e810e4c3.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/moduxanakuri/53513543907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f18cac6-f28e-41fe-bfac-c98d4800dc62/76931775483.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/tamatejuxawidetev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa325f1-d24f-430d-bec4-817b6ef8174d/34707459986.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/curso_de_violo_download.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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 5512 bytes
SHA-256: 1e80fbfe13d4bc981cbe85387ceee2f52b60fe383927e88a32457f1412e49fbe
font_01_sfnt_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 11544 bytes
SHA-256: 3d41daaa34f501e10d6e901b0a2786d99623e59d3a24dd098e502ac3a027de18

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