Malicious PDF — malware analysis report

Static analysis result for SHA-256 e878d76f4084a986…

MALICIOUS

PDF

79.9 KB Created: 2021-03-29 08:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6fe5e6f5a0f9af26511bace4ce9131de SHA-1: 1a7c36a6ded5808dcc7852c6eca02875b6fd881e SHA-256: e878d76f4084a986a378a3515d9019984d4dac88b2d7eb2f43bd369ac4b364f1
126 Risk Score

Malware Insights

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

The sample was classified as malicious by ML and ClamAV, and contains numerous embedded URLs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host a large number of links on disposable hosting, a common tactic for phishing or distributing malware. No scripts were extracted, but the presence of external URIs suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=writing+activities+capitulo+4b+answers PDF link annotation
    • http://e-devletturkiyeaidatsistemimgovtr.com/41420697636cokix.pdfIn PDF document text
    • http://good-production9.site/que_medios_de_comunicacion_existen_en_la_actualidadoxg8t.pdfIn PDF document text
    • http://govnosiakxws.online/64107666444xx8zp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_6031826e69ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5fea45ee8a383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_602e3f6555581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_602cb15e2bfde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_6046902edbf1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5ff801d62feae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_60443f051f608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6015e5bd14d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_603b6963628d9.pdfIn PDF document text
    • http://pitushok.fun/what_order_should_i_read_the_fallen_seriesqu6rj.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/stored_procedure_in_sql_server_2020_with_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_60323c3b778c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xurosuforudev.atwebpages.com/livestock_diseases_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/what_does_service_b12_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/arizona_diamondbacks_uniforms_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/formal_and_informal_email_aptis.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 5492 bytes
SHA-256: ae0528e46e63d8278c47a5172233b5dec3ad803f7bb3925f55f87cd046229a4b
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 11144 bytes
SHA-256: 20aef54af89b89c00a35d3cae8c30f09d9028b915c7c665c451d742b33be2d2f
font_02_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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