Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7de23be41ab83a…

MALICIOUS

PDF

73.4 KB Created: 2021-06-01 20:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 652c53173a0924e8fa6fb060bf7adeb3 SHA-1: d4db996b49dc0f1c8060879ad848038e28263902 SHA-256: 0d7de23be41ab83a71bbc4ea819b3b56ec3d526791292a11b512f29f604b30f6
136 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 point to PDFs hosted on similar domains, suggesting a link farm for SEO manipulation. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and extensive link farm suggest an attempt to redirect users to malicious content or downloads.

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.
  • 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://chcial.ru/pbw?utm_term=ms+word+password+cracker+software+free+download
    • https://cdn-cms.f-static.net/uploads/4466675/normal_5fd72ef1a85c8.pdf
    • https://cdn-cms.f-static.net/uploads/4486971/normal_603ae7a6dcc48.pdf
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5fda114debfd3.pdf
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5fd27507d5cf6.pdf
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/a5d276c7bab.pdf
    • https://cdn-cms.f-static.net/uploads/4477367/normal_606427dc249a6.pdf
    • https://cdn-cms.f-static.net/uploads/4462986/normal_5fe6db3badb8d.pdf
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5ffcc0da154a7.pdf
    • https://cdn-cms.f-static.net/uploads/4476011/normal_5fd3c9344097b.pdf
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/13661e.pdf
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/kirufowuwibuxe.pdf
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5fd34ec212890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jajisaparev.pbworks.com/w/file/fetch/144412797/logic_pro_x_trial_mac.pdf
    • http://funinupun.pbworks.com/f/foxanepifedarixenotajeri.pdf
    • http://ronuzexem.pbworks.com/f/what_causes_crusty_sores_on_dogs.pdf
    • http://wuxikadafi.pbworks.com/f/88183737495.pdf
    • http://niwomif.pbworks.com/w/file/fetch/144426021/ejercicios_sencillos_de_diagrama_de_arbol_resueltos.pdf
    • http://tejudafo.pbworks.com/f/83770650637.pdf
    • http://vadibun.pbworks.com/w/file/fetch/144437388/difference_between_formative_and_summative_assessment_ppt.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_off0000de25.bin
44cdd2c1408c606a18cba2875fb91d8fa332bd59bd6731b5b90cefd3df78f4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 5312 bytes
font_01_sfnt_off0000f064.bin
372dfd6612c15be00215bb3a6fef69316b3340c5b00ead4effc0b6705c307467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 11172 bytes

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