Malicious PDF — malware analysis report

Static analysis result for SHA-256 402dd224ae528d5f…

MALICIOUS

PDF

61.7 KB Created: 2020-11-11 13:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ba2eeec469e770b8bb45c69d1ba1d679 SHA-1: 93e7a2f47f66834c214fe377e2515ad3a1536a46 SHA-256: 402dd224ae528d5fc1b4c1f68dfa8192d96c0355c9047eb5156a5b47eeb63552
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 known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?keyword=ap+physics+1+2017+free+response+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f8b303d643c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5f977dfc79355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451949/normal_5fa7d4e350df6.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/nexofobe_dukan_nonozaguref_jubegesasipofaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5f9398a27ee63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f8bbc642035b.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/nosebofez.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/24348e73d562975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f87023c0d076.pdfIn PDF document text
    • https://pezitojuxesuvog.weebly.com/uploads/1/3/4/6/134608136/4859347.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/jeromopelurab/zogapanaxepovugunujanup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040e7b1b-44c9-41cf-9fd4-fa808c872b7e/vawixonukurotovosola.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/numugalebedener.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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 5660 bytes
SHA-256: e855faa17abbda69dcd30a273f161779d5f676e6801fb5c77d2755e89f95eb36
font_01_sfnt_off0000c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 10360 bytes
SHA-256: 1b82433c8aef496c7dd2b69d81818bd3d1c028daf96ef84503f98f8195ada02e

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