Malicious PDF — malware analysis report

Static analysis result for SHA-256 04df89f6ef87425b…

MALICIOUS

PDF

71.9 KB Created: 2021-02-18 04:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 29d7723656d3837d6ed29cd03703dc8c SHA-1: cdbbe0a192877b898201060f9b6fc7c5371fee70 SHA-256: 04df89f6ef87425bed2028b05bffdf364b84c29a8d5e89e2d9e705243445bf41
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, characteristic of a link farm or SEO spam. The primary heuristic indicates a large number of external PDF links, suggesting an attempt to drive traffic to other sites. While no scripts were directly extracted, the PDF structure and the presence of embedded URLs point towards a malicious intent to redirect users. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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+the+age+limit+for+us+army+reserve PDF link annotation
    • http://oneshops.space/2177643774i9hls.pdfIn PDF document text
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/fopoji-kojokamafideko-zasoxexexibeli.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/i7Vhhhc/speed_racing_ultimate_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/fEigqgd/tip_top_barber_shop_ridderkerk.pdfIn PDF document text
    • http://homebig.space/daxezagelovevudezx8wj7.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/ibgjqge/airthings_wave_plus_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/53giPPE/95795649213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronikazimasusi.rf.gd/wadoj.pdfIn PDF document text
    • http://kodeketabekem.epizy.com/17496002233.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/hyundai_sonata_hybrid_review_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/xujibat.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/notify_e_fitness_pro_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/49082751939.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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 5356 bytes
SHA-256: 24864a1d01573b7e55e21bd170ba48bb61ff628fe2a83214e1688649a2da6f0d
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10408 bytes
SHA-256: 33c6eb2aff29b252b0ebd1644c41d684423f3147be2ce3d70c13d5116aa0739a