Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4161aed83d105c…

MALICIOUS

PDF

76.7 KB Created: 2021-05-13 12:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b14dd2acfbd0220772179c3e5e89379b SHA-1: dcdd34e29af7429f7831a10a9ab75e297f06986d SHA-256: 7a4161aed83d105cc0aca721ee8f1094c09a373d9ddd0a8e57d2d7e2db544ec9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=north+carolina+criminal+justice+education+%2526+training+standards+commission PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380384/normal_606b5aa70fd00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5ff7f99028c66.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jeZUC28/14698712847.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/CShcchj/slices_n_stix_little_caesars_nutrition.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/X1QhaIf/11761693309.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/gijGYtL/gusopatufak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_604fa16b427bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5fcc87bbd1a89.pdfIn PDF document text
    • http://jojereluzexu.22web.org/cinquenta_tons_de_cinza_livro.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/ggUhjgh/41526662133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ditufadupogeju.epizy.com/rivexofutazoserate.pdfIn PDF document text
    • http://zexikewilupime.rf.gd/manuel_de_falla_7_canciones_populares_espanolas.pdfIn PDF document text
    • http://sasomibaben.rf.gd/psychological_literary_criticism_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d26c54-35f0-43ff-ad78-feeb0bba26b3/20455217165.pdfIn PDF document text
    • http://gijurusekaluxir.epizy.com/23422261118.pdfIn PDF document text
    • http://fizenigapajawak.epizy.com/taruzudozavivibizu.pdfIn PDF document text
    • http://ribikusilotagod.rf.gd/12464964524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc53165-ea36-4d8c-b20d-81aaf2dd39d8/why_am_i_hurting_emotionally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab6bf8c-6762-4d9f-b2de-ffa9d0310545/how_to_draw_cartoon_character_eyes.pdfIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_5cc3629a4b174cdb8ed3167a3f7cac5e.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_ff7351cde5284471a4fd48bd0d15ebfc.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 5108 bytes
SHA-256: 542a24a7271d5e317c80671de6742536deb107904b9e4724001d36d8a46621bd
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10372 bytes
SHA-256: b0d8ddfcf87ac6b870569f380fd9f8214a8ac4ecffcb785b1ba99e79a99f5a3f
font_02_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378