Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f447cf786cfed7d…

MALICIOUS

PDF

80.9 KB Created: 2020-12-17 04:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7482bb31586451f54977bd2199982848 SHA-1: 172ab08a46f3bc92cbb70839ec39def7f00eb868 SHA-256: 5f447cf786cfed7d2020281ede3bfdc5ec1f06f17336dadbba93bb77d2dd2514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's designed to redirect users to potentially malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary IOC is the external URL found in the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=wise+onion+rings+vegan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fc05081d0424.pdfIn PDF document text
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/2209608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5fb812cd6d65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_5fb9cb73c2f23.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/setiwezaninobu_jewavog_gorinas_sitobefitugama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_5f97a5efcc25c.pdfIn PDF document text
    • https://boteroxelanivif.weebly.com/uploads/1/3/4/6/134698142/9728540.pdfIn PDF document text
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/9d1f7c0f21637d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a3e0b0-7a7c-4487-9737-cca8f63133fb/swf_player_pro_free_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491a0ede-61ea-4b0e-a799-cf8b17987d16/43118886719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcba4b7-5829-47d1-98c2-43a1e7da4070/goluwupumobub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a378c993-7520-4a29-8b40-ce56b469458a/49687432876.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_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 4892 bytes
SHA-256: fa0bf9a388bbb19fcad1c23b319622ece6795e3a2e0361728898b23f8d050ce8
font_01_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 11548 bytes
SHA-256: ac230b96c48f332f9b86ad46594d11e94f04274e98ff1a1a6398f4a7a1dfa36b

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