Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0d7b848690426a…

MALICIOUS

PDF

91.7 KB Created: 2021-06-04 23:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99177a0dca9dfe95d50d3d2c2870b897 SHA-1: aba54d503bb005894bf536f633a6b6d5640fb9fc SHA-256: 6a0d7b848690426aaf41343b41dfedfa834e13c46defb8f2d9fe2585c697f766
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs extracted is 'https://drafthe.ru/pbw?utm_term=n+c+v+ka+full+form', which likely serves as a lure to a malicious website. The ClamAV detection and ML classifier also indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/pbw?utm_term=n+c+v+ka+full+form
    • https://xefosujusiro.weebly.com/uploads/1/3/4/0/134042031/voxuvosaga-kufali.pdf
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/6430086.pdf
    • https://cdn-cms.f-static.net/uploads/4370278/normal_605720d204379.pdf
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fdedb36ccbb5.pdf
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/038264d09f3.pdf
    • https://cdn-cms.f-static.net/uploads/4449170/normal_5fdabc89d153f.pdf
    • https://pitudonela.weebly.com/uploads/1/3/5/3/135323021/jisitigaler.pdf
    • https://waxatuvew.weebly.com/uploads/1/3/4/3/134371429/watogino_pezuzomokukexe_wubopiwofok_lovidu.pdf
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/1854569.pdf
    • https://gokokunebede.weebly.com/uploads/1/3/0/8/130874183/8761950.pdf
    • https://gisafumeg.weebly.com/uploads/1/3/6/0/136098567/7533031.pdf
    • https://solujasamaro.weebly.com/uploads/1/3/4/6/134695729/4f7343.pdf
    • https://mipadabu.weebly.com/uploads/1/3/4/7/134751654/a3b888055d48d8.pdf
    • https://vegebawijinewer.weebly.com/uploads/1/3/2/7/132740558/lopuxanepuno.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_606770ed1adda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3c0aa54-1a8a-4e05-84dc-69e27ec9365c/42882436673.pdf
    • https://uploads.strikinglycdn.com/files/b84db803-f789-4838-a8f8-4feaf8d08931/grille_salaire_fonction_publique_hospitaliere_infirmiere_puericultrice.pdf
    • https://uploads.strikinglycdn.com/files/1c58a234-c8ec-4ac4-bf83-7f88056c9b29/27839654864.pdf
    • https://uploads.strikinglycdn.com/files/19185728-caae-4f95-86b2-a163b2e55312/77538320244.pdf
    • https://uploads.strikinglycdn.com/files/674c87f6-fd45-4be0-931b-7ed855dde889/98289926805.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_off00012c6c.bin
1d00b67d22e886fe295e5401d357c7361f664d7ff84e7f6f54d6796b1b29f07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 4944 bytes
font_01_sfnt_off00013d3e.bin
74f6c51fd775500e65861e2b68f4d59e88ece88dcca1bf4768b76aedf40dcf60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 10676 bytes

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