Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e12f5ba2c92748…

MALICIOUS

PDF

78.1 KB Created: 2021-03-10 14:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8690ba1a78d14e0a49c5a1cd4bc1386f SHA-1: af408865f3d50a3e1acaad048a8ce05cfcf9bf06 SHA-256: e1e12f5ba2c92748a6456b25e57ddaa555c042ec1f54f3326d5c5f19b5fbf89e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one heuristic specifically identifying a "PDF link farm" containing 30 links. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a "Pdf.Phishing.Trojan". The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=warrior+guide+maplestory
    • https://jolejijiwunepa.weebly.com/uploads/1/3/5/3/135334118/987489a4.pdf
    • http://lobabinuladeri.medianewsonline.com/7121266684.pdf
    • https://cdn.sqhk.co/nebinefis/QjfUQpf/24133408042.pdf
    • https://tazififodokufu.weebly.com/uploads/1/3/0/7/130776891/migabovolalokop.pdf
    • https://cdn.sqhk.co/satijumok/jachggi/infinity_pool_airbnb_miami.pdf
    • https://zonidazoledod.weebly.com/uploads/1/3/1/0/131070441/xexabexujo_kurepug.pdf
    • http://vivubowi.getenjoyment.net/33627945834.pdf
    • http://vodabutopidaru.getenjoyment.net/lenemadowenaviwijik.pdf
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/1d1800b82284.pdf
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/kejonawi-sisofisej.pdf
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/zulijurevawumare.pdf
    • http://lusejifunod.22web.org/42641661459.pdf
    • https://cdn.sqhk.co/bitomasijelo/inichel/84261275606.pdf
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/sekeliniza.pdf
    • https://cdn.sqhk.co/puxedimuwo/cSCjhhb/jusazunozobosafitireme.pdf
    • https://cdn.sqhk.co/xamitarerivu/Bih5ybr/36061752413.pdf
    • https://tivuzukabatabab.weebly.com/uploads/1/3/1/4/131405927/zaloz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/feliso/datepicker_format_yyyy-_mm-_dd.pdf
    • http://sidesapamapa.epizy.com/kilatuguzupiditoj.pdf
    • https://s3.amazonaws.com/pululusodogi/70499941525.pdf
    • http://pimoxonevuwewax.atwebpages.com/ayyappa_patalu_telugu.pdf
    • https://s3.amazonaws.com/jadere/wefosajofaxuw.pdf
    • http://sipopos.epizy.com/free_cebuano_bible_for_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f590.bin
9b348c0440e750f261b63a6e85649e0055dc960f9a7e49802cf7e2e550ff169a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5392 bytes
font_01_sfnt_off000107e4.bin
2add16e8c36b5bc9f961d4612b0fdef20c3782eef528d5ded4a67315065d535c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10408 bytes

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