Malicious PDF — malware analysis report

Static analysis result for SHA-256 375ed5363e4e3efc…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 00:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f92c169d08bbd02c85575b243584bc3d SHA-1: 9c6844212140d00280659a2975ed1d73de3398dd SHA-256: 375ed5363e4e3efc92cb4725000c09ca3aad76997b1bbfacc9b3527e2aabec5e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://midufefew.ru/strik?utm_term=resumen+del+capitulo+1+de+volar+sobre+el+pantano PDF link annotation
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/bavivarotovuj.pdfIn PDF document text
    • https://lanutitokoxoziv.weebly.com/uploads/1/3/4/0/134096970/sumabejoviz_luzelefiviv_suzasaxadaniruk_fixutav.pdfIn PDF document text
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/9f88b0197.pdfIn PDF document text
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/f69db564cd939.pdfIn PDF document text
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/af18afa.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/pegegig.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/lefuzixezuno.pdfIn PDF document text
    • https://bepirujeli.weebly.com/uploads/1/3/1/8/131856565/zovonop.pdfIn PDF document text
    • https://diporatefumidal.weebly.com/uploads/1/3/4/4/134489634/dff90e52fc.pdfIn PDF document text
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/rugejesovosip-muxametemeri-wimufukuwesika-rugafunejarox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46f1e97-c954-46f6-9362-c237009ccdc0/why_isnt_my_rca_antenna_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ce419f-b59b-493d-a78f-37e270524a65/how_to_use_yeti_mic_on_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/best_c_book_for_beginners_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/array_programs_in_java_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/99116311998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6760a331-4968-42b0-be29-ac7a1659bcad/what_are_the_top_ten_stressors_in_life.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/23743313341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d36682-86f1-477a-918a-a009e61434a0/why_is_my_whirlpool_washer_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/49373391380.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/51904713196.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/planeacion_estrategica_definicion.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_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5476 bytes
SHA-256: 8e82a5388c523a10ce405e428be37bf89aeb0606f6f4677dddb4db0a0f227e5a
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 11860 bytes
SHA-256: 0cb8bf1bf193d86041614563c2b2acd793f1c391ba773940d6b8def32ff42844

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