Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbff3259b459386…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 16:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a4eee6d3bfd11d98d3f4ce0fd9934333 SHA-1: f7b8edb9bdbc91b05bdd926a818f6593b9025e08 SHA-256: 4cbff3259b459386acff3303d010e5f679e0ad99e133083a88e3440d277d2ff8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=density+problems+worksheet+with+answers+pdf PDF link annotation
    • http://hookup750.website/bhoomi_film_all_songyga3r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6017bb7fa3b09.pdfIn PDF document text
    • https://biwiporiv.weebly.com/uploads/1/3/4/6/134620494/jafobapakaxuduru.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/gijcjh9/sufawovirurikob.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/id4jfDB/nonprofit_succession_planning_template.pdfIn PDF document text
    • http://dfwshootersupply.com/maxinamanuxogufimagavenijk0bzl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_6035ba4719a6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fee711a463b9.pdfIn PDF document text
    • http://kelnoteres.xyz/directv_guide_not_workingmom49.pdfIn PDF document text
    • https://dezipozapuxel.weebly.com/uploads/1/3/4/5/134595234/6010812.pdfIn PDF document text
    • http://aazzzry.space/zutigucrhmo.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/Vjehjgc/lujefixalumogubexod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/82042065441.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/how_do_i_connect_my_epson_l3110_printer_to_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/dreams_fleetwood_mac_piano_sheet_music.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_8f5abc0a5a13431abe20e02202e64aa2.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_2688f27e84e24be08cc76fe825d6a66e.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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 5676 bytes
SHA-256: b75da31502f41379c55985f0095a0722ea1554e5b94f592e71addffd9bfb0e86
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10900 bytes
SHA-256: e7cb8f97251454327eff3c2e0a6f0e51dd1c3f1a38f6cd846fac5c6c818cc977

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