Malicious PDF — malware analysis report

Static analysis result for SHA-256 9604ce94bc90e3b5…

MALICIOUS

PDF

85.1 KB Created: 2021-04-02 07:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1f77eaedc1113fbf01330b0f4c897dd7 SHA-1: 5b83bf9141712229ba685d581472330e7e5819be SHA-256: 9604ce94bc90e3b5215598a3f04ea417b3574b07f7a8a1b157c2eb1a7b2148b7
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 0.9990

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://bologen.ru/award?keyword=youth+4+3+defense+playbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426421/normal_601dc17bd23c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_5fdbe09899ba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_601fd6de25a67.pdfIn PDF document text
    • http://trackcreditscore.info/xugodesebb7r41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_6065ce753456c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_604e62faeae7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5fcefc14d1c58.pdfIn PDF document text
    • http://kino-vezde.ru/38185578345o3yqn.pdfIn PDF document text
    • http://livecopyrightverification.com/81020574432yy5fd.pdfIn PDF document text
    • http://summer-italy.fun/brother_hl_22400_printerxvm7k.pdfIn PDF document text
    • http://jokixulu.iblogger.org/maggianos_baked_ziti_heating_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_600066e5aa522.pdfIn PDF document text
    • http://kuzamejeluwezik.22web.org/36678811527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365607/normal_600414485b7a8.pdfIn PDF document text
    • http://sodalabs.pro/46312460683kekvc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368978/normal_6007a167a7510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491414/normal_60633d577ecbd.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
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_34fde8f2f0bf4f55bc4629dd74ee8274.pdf?index=trueIn PDF document text
    • http://jowatazurusu.epizy.com/what_is_a_jeep_grand_cherokee_srt8.pdfIn PDF document text
    • http://tifalupu.rf.gd/business_intelligence_books.pdfIn PDF document text
    • http://tojozolatenizum.epizy.com/tipping_points_definition.pdfIn PDF document text
    • http://vinodek.epizy.com/juxiba.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_f2aff7ac31294d3e9bfc8cb2a6ec56cb.pdf?index=trueIn PDF document text
    • http://mesilixogu.rf.gd/convert_into_word_file_online_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 5388 bytes
SHA-256: 99b36130279096ad9d5c7f6eb481733f2eaec9ca5c9cf0a1a7de8572d43fc0c6
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 10664 bytes
SHA-256: c9a4404384061712c989282b6591725c01838bf4ca28b7a7b558ecbe94b9d6ce
font_02_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c