Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7999f62f4e4c81…

MALICIOUS

PDF

62.1 KB Created: 2020-11-10 04:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7a464097c50ab0ff39ad6a58afe1c5 SHA-1: 74b0766d9faef13db8b58c6576bfb51577ae8c31 SHA-256: da7999f62f4e4c814dcae6c8f7ac320a0bf7d7b68b0111d8264f76e222f46a08
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/strik?keyword=l+hopital+s+rule+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f8eb4cd9eb2b.pdf
    • https://cdn-cms.f-static.net/uploads/4406514/normal_5f9ace9fd98c9.pdf
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f89bebe981e6.pdf
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fa7be00bb116.pdf
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/lejegumonivixaro.pdf
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f8dab968a9ca.pdf
    • https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/nepux-jovabilomima-fadosu-sesisanus.pdf
    • https://sukuvigu.weebly.com/uploads/1/3/4/2/134236057/2735202.pdf
    • https://cdn-cms.f-static.net/uploads/4404122/normal_5f9226adcc0fa.pdf
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/dudejelutoxoweterif.pdf
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5fa6b1dfa3d7a.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8806ccd647f.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tadovu/restaurant_cashier_job_description.pdf
    • https://s3.amazonaws.com/giwurode/skyhawk_cedar_point_death.pdf
    • https://s3.amazonaws.com/fasanag/xawaxivefebomozod.pdf
    • https://s3.amazonaws.com/tajimipojimo/wuwodorij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac07.bin
ebac1ecf6e8b1cc007b6c3b68f6d6f906f4fd6d8199555e4a4c2c87a486a8d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC07 2936 bytes
font_01_sfnt_off0000b85a.bin
be8e11baa206a6048d6c4ec5fa8bc52fbb479c00ea0475ab2531100ec0e2e43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB85A 5228 bytes
font_02_sfnt_off0000ca2f.bin
ef602caef552900a6d54b70e3527ae6dbee6a49a105e77ffa067a1670e2fdd55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 9756 bytes

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