Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0b61f1890492dd…

MALICIOUS

PDF

75.0 KB Created: 2021-06-01 14:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7226398a66b8cf8df8b0e58cf5d18530 SHA-1: 9d0f14d48c9386c45a667b320087d4d18f81e094 SHA-256: 4d0b61f1890492dd03b5184c78b5201f8d1c3cb6e6373d234c27cee59a18fc51
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 0.9991

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=video+song++mp4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416305/normal_6066252c540da.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/ledulivibemori.pdfIn PDF document text
    • https://repiwolaz.weebly.com/uploads/1/3/1/3/131381539/tusipovubeg.pdfIn PDF document text
    • https://jimirona.weebly.com/uploads/1/3/4/2/134266163/a6fe10ee3ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_60489687d9031.pdfIn PDF document text
    • https://jodawebodo.weebly.com/uploads/1/3/4/6/134634345/7bfc6f2c04a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_5fe4e20a03481.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/gadapisonu-xilukowowa-katagizagopu.pdfIn PDF document text
    • https://lobubizewi.weebly.com/uploads/1/3/1/8/131856209/pinuzilafozeri.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/1639d8cff7.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/1194270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_6032f702c1b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_6069710ad0fa9.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/fidemuriwegak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_60091ce5be41e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5fcb403dbbf41.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444655/normal_60b02cd730d86.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/ab20b48b-650c-457b-9f54-40c8d2de1982/78558462374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d766f1-38ee-4b91-9c28-082f8b08ae90/scansnap_s1500m_update_for_catalina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97340c71-553c-415e-8798-adf907aa6e1c/most_frequent_gre_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17afc4a8-77b1-40b6-aaae-4f45ead07ed7/rotipuxadudavesinalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda5adda-220b-4038-8ce9-348bd4fdb220/everstart_maxx_jump_starter_600_amp_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec1b95c-ba10-4e83-87f3-0d9dce1c2afb/flying_without_wings_lyrics_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1602014-efa8-4cc7-9c11-a1f569c381ee/three_estates_in_france.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93a0891-acba-487a-ab58-7e0485e02aee/pawexivopar.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 4996 bytes
SHA-256: 1627fd532cdc62a136959aeffde309c602281a1d42934566e255509031864b33
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 11280 bytes
SHA-256: 0ebdff695c449c6c0a06cc72c9a1167c6623ca32b062a7eb68b9c914a8419666