Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c69e7d590b41ba…

MALICIOUS

PDF

82.2 KB Created: 2021-01-25 12:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 979a92f428ad2b4234c49f8000d66b45 SHA-1: a018d754a2418113c3ca0edcf334ea2e67cb83ca SHA-256: 93c69e7d590b41ba29cdf5af3e9cd99e17443c8a35aa1a9f06df8cdad7467ed7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for malware distribution or credential harvesting.

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://leonvi.ru/wb?keyword=multiplayer%20bike%20racing%20games%20free%20download%20for%20pc PDF link annotation
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/9467493.pdfIn PDF document text
    • http://trokot-shopnew.online/tilobivewulenafupewzoiu.pdfIn PDF document text
    • https://bofuvozera.weebly.com/uploads/1/3/5/3/135331850/5747726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_5fd15a6c189b0.pdfIn PDF document text
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/zuxupakox-zikupa-fazimomame-japexakukug.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/wexikozosa-nupujuzitulizow.pdfIn PDF document text
    • http://50offstore.pro/60530098326huz07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427785/normal_6001306010940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_60037a101fa0d.pdfIn PDF document text
    • https://xapitimosigot.weebly.com/uploads/1/3/1/0/131070674/6294226.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/pogolo/62505090536.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/rapejujefopanudula.pdfIn PDF document text
    • http://pibekolovaxizon.epizy.com/bigetadidimowitewevesawuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/4748733391.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/72376614244.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_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 5880 bytes
SHA-256: 7756093fdd845528dec1b71cc38bb5b1e7a7d023ab126514d7c58be5e96332d8
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 10408 bytes
SHA-256: be07c3c6948f3269063c65c9f94d2370b5cfc4f67d794f41c84e4f3b262f325f

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