Malicious PDF — malware analysis report

Static analysis result for SHA-256 70863767fe9b5373…

MALICIOUS

PDF

79.1 KB Created: 2021-05-06 08:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2567ce8f7d1c4a11e9fd5f51de87869d SHA-1: ca4f3b6f7dcf20132b54e428fff340c0d6ecd031 SHA-256: 70863767fe9b53736f303c4840b297744b8d01c75f9f1a25e6b72092c7a89922
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The primary malicious URL identified is https://xajibur.ru/strik. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://xajibur.ru/strik?utm_term=line+6+spider+jam+75w PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458634/normal_600b541342b96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449630/normal_5fc7ea10cd555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_5fda31d68709a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365639/normal_6001193eacf13.pdfIn PDF document text
    • http://pibofari.22web.org/zesuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_603e2a0334988.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowonovege/jafovagatobisuloxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07338fd-1730-46dc-9dcf-1efd4e43fcc4/29981432398.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/melofolabuduxurubiki.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/fenubarekur.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/business_trip_report_writing_samples.pdfIn PDF document text
    • http://dunoziboxisi.epizy.com/battleground_s_survivor_battle_royale_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5866d268-d1de-4df5-8fb3-3455b8a8001e/vegapizazoxeposawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bd3dbe-e472-4a0f-bcfb-91170130d993/roku_3900_vs_3930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71d1551-0ac1-432d-978c-d1a01310fb06/83127571901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbca85b-7960-4cf9-83c1-959ab412bd0d/70438371120.pdfIn PDF document text
    • http://ritebumisopa.rf.gd/zilisegikebujuvomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2fd32f-3700-4160-8f90-5233f5d45105/the_magic_barrel_summary_and_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5577c334-c244-4fe4-93cd-576dde9e223d/5_principles_of_lean_in_healthcare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63568fe6-77e5-4598-8030-31211b04f00c/basikagibedafumamis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f57bfba-e15e-46e3-8f9e-2a2b688b1f6d/15360680906.pdfIn PDF document text
    • http://fifomivosa.rf.gd/chinese_movies_dubbed_in_tamil_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b281dab0-6005-46b5-9959-45bd77bee1ea/dr_abdul_kalam_books_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a79ad0f-3176-4116-9b31-47dc675dc0ff/how_to_turn_on_wps_on_xfinity_router.pdfIn PDF document text
    • http://butozijiko.epizy.com/korozisiwibonazowamat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e68bd39-ec86-477e-ac14-fc5995d4faa5/41267428593.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_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 5540 bytes
SHA-256: 00eed4d8dad69b5b1acaecc593ec6882dd326ae1cdbe56823e0845a1d7b5bc59
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 11024 bytes
SHA-256: e18037780afbcf6ad46014023c577d8e0684c14640123ffb3792727a0708117c