Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c730219c4d4699…

MALICIOUS

PDF

65.0 KB Created: 2020-12-31 17:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 87946af4873f3e495cc991b9d4155a12 SHA-1: 77c229690f400ced5d67671d12104506fe326ea5 SHA-256: a5c730219c4d4699c17bfdc4be9f255b984bc462f1023ee59b2851a83bf742f4
214 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and redirector campaign. It contains a large number of embedded links, including a known malicious redirector at 'traffking.ru', designed to lead users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it's a generated PDF, likely part of a link farm to improve SEO for malicious 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://traffking.ru/123?utm_term=physics+lab+rutgers+reddit In PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/c3971992943.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/817c7fa04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fa5d08116eec.pdfIn PDF document text
    • https://mipupupomekux.weebly.com/uploads/1/3/2/7/132712043/3e59a1f7.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/4ff02bcd-a8c4-451d-8581-5940dcc04a53/oceanhorn_apk_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/43947985744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76a2591-924f-4273-af0e-34bea5fc5886/trke_paragraf_sorular.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/arma_3_altis_life_free.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/29330501689.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/free_educational_games_software.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/89904928759.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_off0000c165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC165 5444 bytes
SHA-256: c2f92c640df57b99cb636e5591aa8a7856aaa133ef2cb722d33d00d7bf365191
font_01_sfnt_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 10492 bytes
SHA-256: a6ba63f174568055e131e94fca8930e9a47c24144de040b5f37aceeb066a8469

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