Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c8021ca49d8444…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 13:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 567e22f45008b3940376aa2f17069157 SHA-1: 5944cf39cc732cf565142b6cb94bd0a375f70160 SHA-256: d8c8021ca49d8444f2a071de4ad822a53c5e7efa0183579feec4e1b99c12e438
244 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, and at least one known malicious redirector. This suggests a phishing or scam attempt designed to lead users to malicious websites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/aws?utm_term=what+is+wahls+protocol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_6061ca979b50b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fef858671964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_60411f5aa9937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5feb6805cb205.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/gghgdgf/tanglewood_apartments_phone_number.pdfIn PDF document text
    • https://zefilezagomi.weebly.com/uploads/1/3/4/4/134474677/banusifubuvopo-bukutojowo-julebo.pdfIn PDF document text
    • https://wukugisusip.weebly.com/uploads/1/3/2/6/132695501/9533572.pdfIn PDF document text
    • https://pupifino.weebly.com/uploads/1/3/0/7/130776741/f808e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_6037c67181aad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5fef1bbb5dc87.pdfIn PDF document text
    • https://cdn.sqhk.co/tojegaxamox/d1jb3fG/xetizometoditogod.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/aZiihhN/petigefi.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/CRgghin/91257329270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_41842f952174448a86dbdf6fedfb8f9c.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_c70ebe1ad103434e8217e0aae435651f.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_ec5cfd1f8d8045569eac06cd2eb16a93.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_c16b665fac1f4648b3482c32ea931106.pdf?index=trueIn 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_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 5128 bytes
SHA-256: c659a1e377c1ea3fa9d56e992ea4a9b1787383c80c17fc5838524ee3bc3cc6b6
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10920 bytes
SHA-256: 8a981d75a5f3c12da99551fed36d7312e7a9558c1eb1b3e4bfb8d16a45713f74

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