Malicious PDF — malware analysis report

Static analysis result for SHA-256 8909c7c61e637d0c…

MALICIOUS

PDF

81.7 KB Created: 2021-04-14 05:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 12a939be2de3c394cf44f8322cca555f SHA-1: 3e1fb66526bff54383777c1d14f0f3380c3a6f39 SHA-256: 8909c7c61e637d0c567ad0260aa488fbedd440d367791fae9dec991e7358c14e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, including disposable ones. The presence of a `utm_term` parameter in one of the URLs suggests potential tracking or SEO manipulation tactics. While no scripts were explicitly extracted, the structure and external linking behavior are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=can+you+get+banned+for+money+glitch+gta+5+2020 PDF link annotation
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/3800801.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/xakuvutelofafu_lowejir_susubegi_tijadeluniriwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5feb559b8bb85.pdfIn PDF document text
    • https://tosabavol.weebly.com/uploads/1/3/0/8/130813831/1372059.pdfIn PDF document text
    • https://radobejaka.weebly.com/uploads/1/3/5/4/135400195/diwobu-bejudotulikodu-vepiboguwet-dizoxipisim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5fcef63d6546c.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/bojaroladutor.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/zitexenerejemexuduzu.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/difufinuvekez-nujawifo-buwowi-mopanotadabaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_60379336e7ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_6037a9914489e.pdfIn PDF document text
    • https://bumaxaxup.weebly.com/uploads/1/3/4/2/134235918/97b219de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_605f4c8b19f40.pdfIn PDF document text
    • https://nobibiraxofos.weebly.com/uploads/1/3/4/9/134904538/95e58.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/mukometirixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5fc6c25949adf.pdfIn PDF document text
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/regesaf_raviwaga_xijajuxibemumu.pdfIn PDF document text
    • https://kofukupapakube.weebly.com/uploads/1/3/4/5/134586312/rivemofufomaloz-xozabux-lafome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6011986f2d4eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5fde8ddd6c683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_696a94f59b2844349a18613d056ea4a7.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_4f059d044a1045b69d3f9d6b674760e7.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_f6ba34ba28cb4d7088bed1b5f878753b.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_c1b3f061fd534168a4404f1065757e8b.pdf?index=trueIn 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_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 5800 bytes
SHA-256: e534ef39b5f1bfd7723fe6a967ccf219f78b1086b468e76e96a523531ea86811
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 11424 bytes
SHA-256: c5df2ac80875c41a2e3f7cdb81f2147eb946f8727df6d46b84e4fa7093c2e7cd

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