Malicious PDF — malware analysis report

Static analysis result for SHA-256 054449cfdadc25b6…

MALICIOUS

PDF

84.9 KB Created: 2021-05-29 19:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2c161ddbf70c44618ad7d6c259e4b57e SHA-1: c3f5a8ac834e453d47ed580c756bda2389b6f285 SHA-256: 054449cfdadc25b6b47fc63ac176db4458fe74068a28116dfeb256dc69401dc5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm intended to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to host malicious content or redirect users to phishing pages.

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://seumenha.ru/123?utm_term=school+subjects+worksheet+doc PDF link annotation
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/basitubisevorad-lozib-jawekupup-ginegekab.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/tutibiboxibekagekevu.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/mabofemit-bilemuwufo-difabivapoxagi.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/nukulozofebowirase.pdfIn PDF document text
    • https://zakisegozazamig.weebly.com/uploads/1/3/4/3/134346543/golirudafusod_lunubatige_xesoraz_moxafobiso.pdfIn PDF document text
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/c7950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489839/normal_5fe2fcc055223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5ff7575a7e02d.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/juzijokol-zakewuwaxat.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/2da03762fa8413.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/b390c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_5fda4ed5c79bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_603820e1b3c4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5ff7a320cb273.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/tudenivekazusetisedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec1ae3d-022c-4e45-bcf3-cdbcc2e8deee/manual_flash_canon_430ex_iii_rt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425d86f3-1d03-4e0d-9d11-b1da38411d82/el_poder_de_la_oracin_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07345962-e6c6-42de-ba96-779d2d813245/firuwexorudepemimora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e69ba70-20b4-46ce-a8ed-08e4ff443c84/vygotskys_social_historical_theory_of_cognitive_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4472eef-df80-475e-950e-3983b961c3e4/xatexinesivesuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517b4a11-1452-41ac-9749-9991f90d9880/you_ka_matlab_kya_hota_hai.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 5292 bytes
SHA-256: a5c7158d0164010ccc84e4792a446c8955a9d56929cbbc1787a6b096de894cfd
font_01_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 11456 bytes
SHA-256: 0a28021ac221a4e9ccd922ccdf6b758e9ebb14cb7ff0225744e6bbaec490387e
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 16108 bytes
SHA-256: cd248ddf65cba76856a38788c5be45400c6993d78f7d93e85fcb70b38d74b54a