Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dfb2ae1df36d57…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 01:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3d9e2737a38109d94ed6dbf7df3e220c SHA-1: cef0424760f9350ce55170bfb64ad26bc92a4082 SHA-256: d1dfb2ae1df36d57d43b1e4c4ce9cbce31296ac22361400ebbb049907c5bc65a
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to external websites, as indicated by multiple PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristic firings. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=how+to+deal+with+enfp+personality', suggest a phishing or SEO spamming intent. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=how+to+deal+with+enfp+personality PDF link annotation
    • http://botumudasotap.iblogger.org/what_is_grounded_theory_in_sociology.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/iijWifx/bajobopinikovaba.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/gigq7ii/wall_kickers_mod_apk.pdfIn PDF document text
    • http://vevujegijozu.iblogger.org/36766305532.pdfIn PDF document text
    • http://sorifaj.22web.org/44078614938.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/hfhdfif/ground_operations_job_description.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_b845657b5538441983eb20ea6c8588a8.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_251d9f890bd34a0889e73f2bd422baa6.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_bfa64c7dcbdb46edbbe694f78e345e37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26157d8-4bb7-429e-a604-771166da70c4/11417145392.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_ff8b5e0609d34fb1ac4ae7506ccd595e.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_90b7feb9db5143a592dcbdfca48731de.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_05f132c56473491ea7e715885bf37e60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8795ac-b28c-4db9-9e68-57feeadbd6ac/how_to_fix_irobot_charging_error_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072f6378-478b-4cf0-bec5-902d151c9104/pudelex.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_db62fbae749245579db9e6f50b84ff0d.pdf?index=trueIn PDF document text
    • http://lunobuxuwore.rf.gd/dragon_city_ancient_portal_breeding_guide.pdfIn PDF document text
    • http://zimaroted.rf.gd/zotet.pdfIn PDF document text
    • http://ronevudewakoreb.epizy.com/40638803121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a6a3e9-4d9c-4650-bfd7-11436559bebf/lezaxosalawawugebivore.pdfIn PDF document text
    • http://jijawidifopaw.epizy.com/91041553875.pdfIn PDF document text
    • http://xafamikipu.epizy.com/35155652292.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_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 5284 bytes
SHA-256: db84c3117a86a5b456c44c37e865f4705f0af493d47d618309aebab6c77e0bd0
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 10928 bytes
SHA-256: 2436f208fd7f474235ea59ff70b8723b92058dc19372ed8e9e0a804e89ac1fc7