Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d1c0856d8140dc…

MALICIOUS

PDF

80.4 KB Created: 2021-04-03 00:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a9d88c9a7464b248fb094910f731a5e SHA-1: 9820d1f8d5274272d533babfe963b5c9a70d6672 SHA-256: 11d1c0856d8140dc7b641b95efe218786b9bb4a000daf2518dcd43a18f75592e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to malicious content. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=how+much+maize+seed+per+acre.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+much+maize+seed+per+acre PDF link annotation
    • http://munupesifak.22web.org/85616484714.pdfIn PDF document text
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/xapuxukodovuwod.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/cf1b26c42.pdfIn PDF document text
    • http://xosudodobuj.iblogger.org/nurux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefegasoro.epizy.com/37664361974.pdfIn PDF document text
    • http://tuxugev.epizy.com/nepagane.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_5f80b6dedb7c49c4ba3dd1d75abcfbf2.pdf?index=trueIn PDF document text
    • http://lugixevizopef.epizy.com/52946064447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6647d8d2-2463-4a81-a0e6-a8de46ea1a98/73119549662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af4415d-b056-407b-b833-713be074ec6f/74704752867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff6cc41-e665-43f6-a20e-e205f722f29d/risot.pdfIn PDF document text
    • http://gebaruzowulidus.epizy.com/jeraf.pdfIn PDF document text
    • http://pifexowofimef.epizy.com/linking_verb_worksheets_grade_3.pdfIn PDF document text
    • http://xavitemis.rf.gd/83660771475.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/84128590309.pdfIn PDF document text
    • http://kujofumuv.rf.gd/risuxerovumusofidegipida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098d379a-05f7-437d-91b0-e9c764c98246/tavujifapo.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_e1897e29c7e74246bd7d152b7b401eff.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_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 5384 bytes
SHA-256: f5b11093b4f6a6dee2df8a79228c96246a517081ad6eb88b1d848ca34ee5f4d7
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 11468 bytes
SHA-256: 8fdb2bbcc64d0296e6e3a5e8b4cbd65659ee9277520a113396dec92666d753d9

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