Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ea45c137b0397d…

MALICIOUS

PDF

71.0 KB Created: 2021-03-01 00:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 52dc8dc248b74aead027222ba47ba08f SHA-1: c94e9624f146d88d9843a3490ea693527880f1e3 SHA-256: 13ea45c137b0397df7508b500969c57bb7b2b1dcaa500d3cf356a358d23ad3cd
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious purpose.

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/123?utm_term=national+board+for+professional+teaching+standards+certification+fl PDF link annotation
    • https://cdn.sqhk.co/wobivada/JdPhdKJ/maze_runner_2018_full_movie_download.pdfIn PDF document text
    • http://susozatatesowa.22web.org/what_is_the_lost_continent_in_wings_of_fire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5fdf1c68eb200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_6008e4e2054de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd6771bb638d.pdfIn PDF document text
    • http://kigazuvunawolux.iblogger.org/whatsapp_business_en_uptodown_com_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/Gigjaji/mabofiziregifugesen.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/vampire_diaries_finale_did_damon_die.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/JgiNPid/the_chosen_season_1_characters.pdfIn PDF document text
    • http://zobegodu.iblogger.org/startup_e-commerce_financial_model_excel_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_603b12fa0777a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_602c12874f3c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/hp_laserjet_4015n_printer.pdfIn PDF document text
    • http://dagogedimin.rf.gd/20607508827.pdfIn PDF document text
    • http://wudokuzogikozu.rf.gd/hospital_administration_and_management.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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 5524 bytes
SHA-256: 972a80e8c006e89de2a59ee8bef15b500ab7ed4c539f0006919f1dc4fb7406c6
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 10184 bytes
SHA-256: 66a9dc38e60e9e838a8d0d549cafc77ade51b404c9b4a97c3e11073b61699bf7

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