Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ed1d28197cb5b3…

MALICIOUS

PDF

81.8 KB Created: 2021-01-30 16:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc3daf6fffa6866b9affcebd0ab04955 SHA-1: 27c861399505862bbd19331c642ce735a5ce7449 SHA-256: 38ed1d28197cb5b3fb2a03ae94af7f394a9110bb60ef6e0e623deb1744cf29b2
126 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 or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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/aws?utm_term=web+template+psd+vector+free PDF link annotation
    • https://jezinuva.weebly.com/uploads/1/3/4/8/134869759/xozofukur.pdfIn PDF document text
    • http://femokotafi.66ghz.com/36815889182.pdfIn PDF document text
    • http://nokekowukubu.22web.org/aaj_tak_app_free.pdfIn PDF document text
    • https://suxaniwaxunese.weebly.com/uploads/1/3/4/3/134385499/6170433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447265/normal_6006b2df32eb6.pdfIn PDF document text
    • https://negowisavu.weebly.com/uploads/1/3/1/4/131406226/33def.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/jikijuti.pdfIn PDF document text
    • https://zajolapa.weebly.com/uploads/1/3/0/7/130776493/beab2665a4e07.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/xexunutat.pdfIn PDF document text
    • https://bikirufiw.weebly.com/uploads/1/3/1/4/131452989/6934699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5fdc6c05617f3.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/dipivamugivilude.pdfIn PDF document text
    • https://xodinelexobi.weebly.com/uploads/1/3/1/4/131438891/newamusiva-porog-romawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5feaec31ba52a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ff0286ee12cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_5fe3c6357c0a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_600e0c08400e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_60089ca08744a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butaxogusevi.epizy.com/yahoo_fantasy_football_cheat_sheet_auction.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/zazililisaxelor.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 5512 bytes
SHA-256: e542076f71d388c64a61722dd9d3f4c9bf9645232a4bd16643699264cca090a0
font_01_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 11036 bytes
SHA-256: 00ef3cfe51567d0d3c609dc5acec5bfda829714959035dd53c26563781a126e4

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