Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc691228a8f5f5bd…

MALICIOUS

PDF

73.6 KB Created: 2021-03-28 12:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 389256cbd7bba53b490958cb92337789 SHA-1: 180be231f93789c94d6e85ac5b2c9d512dcec35f SHA-256: bc691228a8f5f5bd07345a48bcb68a1d4ba54a17bca7d6418b22f54dc980b861
186 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to malicious URLs, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The primary malicious URL identified is https://xajibur.ru/strik?utm_term=star+wars+books+to+read+online+for+free. While no scripts were explicitly extracted, the PDF structure and the nature of the link farm suggest an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=star+wars+books+to+read+online+for+free PDF link annotation
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/sonunebirix_zopap_danumonuwije_tarorim.pdfIn PDF document text
    • http://opticsystem.website/gowutugezonotak0vwq.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/h6jbFXW/rewolelezumeve.pdfIn PDF document text
    • https://pipenuxoj.weebly.com/uploads/1/3/1/4/131406698/8928678.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/hejbnic/vfx_free_videohive.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/2849300.pdfIn PDF document text
    • https://jofovumilaj.weebly.com/uploads/1/3/2/6/132681264/9844380.pdfIn PDF document text
    • https://todatotosikuped.weebly.com/uploads/1/3/0/7/130740429/kusokakupemut_nusabomo_fojome_wejimoxirenew.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/monimukeresonigelome.pdfIn PDF document text
    • http://neip-forum.fun/maytag_bravos_top_load_washer_and_dryer_settwafg.pdfIn PDF document text
    • http://lovechat24.club/jali_design_patterns5xz6r.pdfIn PDF document text
    • https://lesavamu.weebly.com/uploads/1/3/5/3/135347369/3ae54b67d6b3.pdfIn PDF document text
    • https://fepapidatimupiv.weebly.com/uploads/1/3/1/4/131437812/matabud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_16389643ba7f44a188d314da0b0b2439.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf20a79-1859-4caa-aca0-74aa6843cf5c/61074024359.pdfIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_7c847a1643bf41748e5556d8786e9770.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_d276653c4af7420fbd86b2da6e291455.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/644cadff-9a16-4d90-a544-ab985ec437f8/39163932946.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_adf8d4b97e2b4a5db46599b5bb90f0fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e017552d-89a2-46d8-ad20-ebc54d5a443d/se_ha_perdido_el_pueblo_mexicatl_poem_english_translation.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 5300 bytes
SHA-256: 26621a60e4b0bb3b6c386586845a90c41b58ed301ec2f45a868286ebd6661a2f
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10360 bytes
SHA-256: ec3899a1fb4f71ed4bae8c99868690dfe524471d1ab30b8bf0c263c876d64624