Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea321adbafa4964…

MALICIOUS

PDF

80.2 KB Created: 2021-04-02 02:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 30d26d2ca7002b87e418311d12f7ab69 SHA-1: 8f4576fda40772d045fa885b13b9f34c72311e65 SHA-256: 5ea321adbafa49640841f0cc6ccd241c8461c300d34946cd94c19a18e46f992c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, with a primary focus on 'https://zajinet.ru/strik?utm_term=new+yorker+crossword+century+21', suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual content to indicate its specific purpose beyond the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=new+yorker+crossword+century+21 PDF link annotation
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/wunimefaj-finabodugasijud.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/1643848.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/9598429636.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/f4sjehY/how_many_minutes_to_bake_salmon_at_400.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/hfCEhcs/cute_dog_live_wallpaper.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/zuxagazixekuvemixotizi.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/how_to_draw_a_simple_german_shepherd.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/gimisorixosu/21043541546.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/architect_contract_template_philippines.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_4f6b265a504d4a38ad66009deef5aa65.pdf?index=trueIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_314df6550aa744ab8e9a9eb6572a8987.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/hc_05_bluetooth_module_pin_description.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/fadukororuzafosa.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/airborne_magnetic_survey.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_76dd81a2918d40589eb3761707f80085.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/kuxetes.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_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5100 bytes
SHA-256: 2d99c162cad5709dc3d907ac25fb4caf4858360aa84e8553afff2c210718f3b2
font_01_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 11592 bytes
SHA-256: 1d9a2dbb3d3e310028a256a68db99a27f36aed526268c6ed18ea09fe833fc348

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