Malicious PDF — malware analysis report

Static analysis result for SHA-256 167155abf8403053…

MALICIOUS

PDF

68.5 KB Created: 2021-02-20 01:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd75151875d096b692c2156507c302f1 SHA-1: 37ff8f704ba37c1455b121bd23ceb1b4c34d67ca SHA-256: 167155abf840305361c98f7617eea4889fc80ac4cb5021c8bfc4289f53475d39
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the document's structure point towards a phishing or malicious redirection scheme, likely involving the distribution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=business+communication+class+topics PDF link annotation
    • https://cdn.sqhk.co/lewiwifo/gfhcQke/choi_game_brain_test_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fe6f6c3d8ac9.pdfIn PDF document text
    • http://avtovishki-msk.ru/history_of_modern_art_arnason_7th_edition_download_freei6qj4.pdfIn PDF document text
    • https://cdn.sqhk.co/gurukemopuge/PxWgf3K/supimitol.pdfIn PDF document text
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/wivobos-rarog-welalepuna.pdfIn PDF document text
    • https://womagojewe.weebly.com/uploads/1/3/5/9/135961056/4acd2007352d272.pdfIn PDF document text
    • http://medyahanem.com/crafty_crab_menu_jacksonville_floow2w.pdfIn PDF document text
    • https://cdn.sqhk.co/bitajububida/hhypHrz/first_4_words_of_the_declaration_of_independence.pdfIn PDF document text
    • http://lightly.store/tivufororukno9n5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_600be6f36cef9.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/nokidi-galevugumekave-gewivo.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/fXViiHB/asteroids_arcade1up_75.pdfIn PDF document text
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/getaneg_zobek_xekozuren_samojeti.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/11ifhaz/66302754218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 5032 bytes
SHA-256: a1ea05250dd7f74f362a89179da2e73eb24a7050b1d1b7688f4abf4815d03819
font_01_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 9760 bytes
SHA-256: 2ad4b10408341dccfb8c9df94382963687d976cc3d40ccbcb49963b924d735ed

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