Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecd7df345e00273…

MALICIOUS

PDF

83.6 KB Created: 2021-03-11 08:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6da6d7e727022387a318e105bc693731 SHA-1: 0158c243b13d4285a564ad59f6521ec145154cff SHA-256: 1ecd7df345e00273177af53dcb9e36b0788ca55947507a9002b0888c714e29aa
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to disposable domains, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The PDF_SEO_LINK_FARM heuristic specifically noted a large number of external links, with the primary example being http://fekerudosepu.rf.gd/trends_in_the_periodic_table_worksheet.pdf.

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://resalured.ru/123?utm_term=i+the+supreme+augusto+roa+bastos+pdf PDF link annotation
    • https://cdn.sqhk.co/nerenina/Oy8hjzt/45530823861.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/88748495027.pdfIn PDF document text
    • https://cdn.sqhk.co/zimofuzam/1Tjb7ii/91934878271.pdfIn PDF document text
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/6548379.pdfIn PDF document text
    • https://fofulusi.weebly.com/uploads/1/3/4/7/134774969/2b2ac11cf27e7c1.pdfIn PDF document text
    • https://xogalorezekulim.weebly.com/uploads/1/3/5/4/135400954/vufakumel.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/3114338.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/formato_de_certificado_medico_laboral.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/7942413.pdfIn PDF document text
    • https://darifojiwuz.weebly.com/uploads/1/3/4/5/134588766/7fbd95e1.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/what_does_no_dos_equis_mean.pdfIn PDF document text
    • https://bavamelamasol.weebly.com/uploads/1/3/4/7/134714994/sarelonovubufev-similobo.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/86154b10d9.pdfIn PDF document text
    • https://kusovagojevo.weebly.com/uploads/1/3/4/8/134883394/7478384.pdfIn PDF document text
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/9153046.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/27395860567.pdfIn PDF document text
    • https://tuzigopidimeb.weebly.com/uploads/1/3/4/3/134320631/fcd9d2dadc.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/dokekawoliwudos.pdfIn PDF document text
    • http://makilevemifaw.iblogger.org/51015777003.pdfIn PDF document text
    • https://cdn.sqhk.co/tipesewete/9ijdgPq/daily_express_sunday_crossword_answers.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/3326608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekerudosepu.rf.gd/trends_in_the_periodic_table_worksheet.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_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 5500 bytes
SHA-256: 2c52d45123f3772ce765f1b7c76165a0e0a6b687f37859e0fcf6a47037599082
font_01_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 10608 bytes
SHA-256: 2f6d528069bfc12c50c031af1eb65e291cc14d9666f3acf5ae51788e2e8c3f18