Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f7f75ecd203cd6…

MALICIOUS

PDF

123.5 KB Created: 2021-02-25 01:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1255a6deb8b061c3e64655d7064e3060 SHA-1: af02926adf993396c217a12e679df48a4c867e7b SHA-256: d3f7f75ecd203cd66e22fcb95fe61e276566ac97d96aa64353196b581a6f71db
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to other PDFs hosted on disposable domains, likely for SEO manipulation or to distribute further malicious content. The presence of many external links on disposable hosting suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=what+is+pluralistic+theory PDF link annotation
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/3338171.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/fedakadir.pdfIn PDF document text
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/jalijuwitobabafomu.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/9741970.pdfIn PDF document text
    • https://norasegineze.weebly.com/uploads/1/3/6/0/136082699/86c378c0e156e.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/4d7786.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/xeludixosaroxanora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_5fd611bb5de4b.pdfIn PDF document text
    • https://gavuwili.weebly.com/uploads/1/3/1/0/131070236/baxadamipupugox-konub-nuzixezil.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/de_que_se_trata_la_obra_cien_aos_de_soledad_resumen.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/f53e6c69626.pdfIn PDF document text
    • https://gurosutu.weebly.com/uploads/1/3/2/3/132303194/9516786.pdfIn PDF document text
    • https://vemugalibi.weebly.com/uploads/1/3/4/4/134484787/rakisazekifag.pdfIn PDF document text
    • https://jipewufonafu.weebly.com/uploads/1/3/4/7/134709519/lokutipibude_gelew.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/duxizadozizofup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_60083fd89fa2b.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/lejigakow.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/2429505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_60242edb8561e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_601635807f64b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/32591106682.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_off0001a70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A70D 5136 bytes
SHA-256: 311c9d27dc09614371687330b648e6d6b6b9120b6d9179528909a6261a676b51
font_01_sfnt_off0001b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B894 11904 bytes
SHA-256: 9e98e5ca9ad0d2a6d841126188d7c931be56ce5975dab21df4177fcd53477623

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