Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a804b0e95b2fc…

MALICIOUS

PDF

80.9 KB Created: 2021-04-30 09:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a335c52d5d56f2fa24793712b4bb164 SHA-1: d7aca69160131b27035907cf649fe05c5509c4ec SHA-256: 6c8a804b0e95b2fcfc1ee3ee53415328c8baa2b553503078edb84f213f327214
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded links and the heuristic for a password-protected archive handoff suggest the document is designed to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=netgear+n300+c3000+factory+reset
    • http://omoikiri.info/xofazukenokixadiwediribun.pdf
    • http://kesuvajeb.scienceontheweb.net/nexotuxebakiratogatotij.pdf
    • http://kalowodopole.mygamesonline.org/23070079441.pdf
    • http://nadefememidep.medianewsonline.com/control_de_contaminacion_atmosferica.pdf
    • http://lixusopo.mywebcommunity.org/descargar_diccionario_ingles_espaol_cambridge.pdf
    • https://cdn-cms.f-static.net/uploads/4485149/normal_601906ecbfb90.pdf
    • https://cdn-cms.f-static.net/uploads/4384045/normal_606ac849e27e6.pdf
    • http://devivitonewe.sportsontheweb.net/dungeons_and_dragons_character_sheet_5e.pdf
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd676a9a465d.pdf
    • http://usersonlineguardingsettings.site/86749538237ap7t4.pdf
    • http://senteber.site/fraction_bars_worksheethao9s.pdf
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5ffb49d6b3f92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_107a0c8e6d1d47bc97926eb5480d464a.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_0679ba810da34c649ef3b05dab0edc92.pdf?index=true
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_0f1d1bfdb824482da5e10f303e3601d5.pdf?index=true
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_90f2f596c4bf4b62b3765d9f43080df6.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_fa435f7c55c0497983ec9fb88adcb061.pdf?index=true
    • https://s3.amazonaws.com/widiku/sosegem.pdf
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_b0c1b61beaea4068a21e5308ecee4a5d.pdf?index=true
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_5c481935a0be402086faa085cb269a2f.pdf?index=true
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_109de57df08c47608ddcc172bfdefc8c.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/sovokugaxafaxarivomowi.pdf
    • https://03234a85-d811-4a68-a1f9-f7315bf9ccb2.filesusr.com/ugd/079591_df838904e1594132b6c7a8129bfd2595.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8b.bin
d5ec56643deb3b318c46c24efe8437fdaf9fc479d68c08120fd23565e9c76dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 5136 bytes
font_01_sfnt_off00010111.bin
2e801f5f3e735b0cab2bbfa2889d58d835241577d936e42d3c06f1fd4cf50e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 11548 bytes
font_02_sfnt_off0001280e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 4324 bytes

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