Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4469d58d7d2b08…

MALICIOUS

PDF

68.0 KB Created: 2020-11-23 01:38:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 799f3843cd66a6d09c7f9d0313e02b49 SHA-1: f25c56b5e085f710024e54ed065bad8fde3b3cbe SHA-256: 7f4469d58d7d2b08e2cef3a5332cd6c7fcad9c346313e20c76d3dfe7c8063e2f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. This indicates a link farm designed to distribute potentially malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly support its malicious nature.

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://traffmen.ru/aws?utm_term=chirutha+movie+songs+naa In PDF document text
    • https://mukoxorokote.weebly.com/uploads/1/3/4/5/134576398/9916300.pdfIn PDF document text
    • https://boxolajabamofi.weebly.com/uploads/1/3/4/3/134356625/naviro.pdfIn PDF document text
    • https://wemugevesusufe.weebly.com/uploads/1/3/4/4/134467109/761273f0.pdfIn PDF document text
    • https://nurigefisigutip.weebly.com/uploads/1/3/4/6/134628418/lasevevuxodupamuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f8dbb9cec82f.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/xajamofufojemo.pdfIn PDF document text
    • https://fivalukovegobag.weebly.com/uploads/1/3/4/6/134693255/dfe534919fed6b5.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/38a4bb514f8.pdfIn PDF document text
    • https://wizodorifezeniv.weebly.com/uploads/1/3/4/7/134715638/jijuji_robetag_fejabi.pdfIn PDF document text
    • https://telenegogak.weebly.com/uploads/1/3/4/5/134522167/vigikabikanimis.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/bokexizometun/homedics_shiatsu_foot_massager_air_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e600f61f-d87a-42d9-8a9e-a64a21000c00/newexiwevegovimobixirixaf.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/21971422535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3acedf-3a8d-477b-b077-5f2a08abac04/tofukizafirimapiwi.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_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 5032 bytes
SHA-256: 5da164239a156897fc572c63264cca0f63d3a2f6fc08f43c301d98d3d7dc3d78
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 11112 bytes
SHA-256: 48961a5455beaf53d7dcad9312016a324a3dd67d680c0f4b7b55c6231081b7aa

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