Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58872a7f3736fd9…

MALICIOUS

PDF

67.3 KB Created: 2020-11-14 10:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1a44c92339376089010273a75cb5c5a8 SHA-1: b6135bedbb8ac84e2109127f656add535984accb SHA-256: e58872a7f3736fd99f962cfc300eaf1f25652c7e90369fc6ec19c5f590e0db6c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by both heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lead users to phishing sites or download further malware.

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
  • 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.
  • 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://trafffi.ru/123?utm_term=the+three+g%2527s+of+exploration PDF link annotation
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/1969371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f873413bc404.pdfIn PDF document text
    • https://velebipuzufal.weebly.com/uploads/1/3/4/4/134434208/xebajotukozuf.pdfIn PDF document text
    • https://pasukanat.weebly.com/uploads/1/3/4/4/134474220/wonikotuduwafa-vomaperabobafof-temuf-sudavatuxopitut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_5fa17a5fdd42b.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/bedijenutowulixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5f99dd803dde3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5fa8013163481.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/cc0b5212d.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/94ce66b7.pdfIn PDF document text
    • https://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/rejanuka_sifugididu_burimufasux.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/37c9f770-ab8b-45e0-aedd-5352a0d085e1/bad_boy_mtv_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/80713720203.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/solve_elliptic_pde_in_matlab.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_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 5216 bytes
SHA-256: 3207d9b3c8a71f5c5402578af796d513cd08a1b26a6d283d4336601e7ddbd8ae
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 10704 bytes
SHA-256: 1bae69bcc47be1cc00eedf161c5f9170351ac20df0aa26fa57a5d7ded2ac781f

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