Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef739c701705522…

MALICIOUS

PDF

80.4 KB Created: 2020-12-31 01:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 00d17355f33d22c48fdb1f29a35da32e SHA-1: d933bc0bfad307e6d20db314589fb59a4c8e7463 SHA-256: eef739c7017055227c975ad32c48a52bdc98f1f9cd90cf23ab0cd1cc3cf7a3d3
264 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffine.ru/strik?utm_term=greenland+movie+release+usa In PDF document text
    • https://cdn.sqhk.co/moviferu/djifNBc/retro_space_phoenix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5fd03e3906c34.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/cEgcOij/leveling_guide_ffxiv_70-_80.pdfIn PDF document text
    • https://labegemi.weebly.com/uploads/1/3/4/7/134709462/zonusuvizibufona.pdfIn PDF document text
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/naxojef.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/O5pgege/playrix_stock_ticker.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/9305791.pdfIn PDF document text
    • https://kesuwevibumeju.weebly.com/uploads/1/3/0/8/130814845/widonivokokupe_diliwaba_luxaxusowilox.pdfIn PDF document text
    • https://xubesizodumuruk.weebly.com/uploads/1/3/4/7/134703494/8555450.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/jd1Ijgu/dojosumib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fd61e5139696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5fb97b97b4991.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/bed9d69d-4ea7-4d67-a5f8-ea408bdd8500/stasiland_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d9053a-1fdf-476a-9410-2309d060efef/koparimeloxunizus.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/ssc_steno_recruitment_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/3997543795.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_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 5060 bytes
SHA-256: 872cbbdab85021c277681b7d9a9ce79cdca97a47a4453778c1193a0da329f7ba
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 11436 bytes
SHA-256: 95cf03993935934020716bf43bd964f16bf552db55e07431ce6a482bc6800407

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