Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b40915fdef13fda…

MALICIOUS

PDF

83.4 KB Created: 2021-03-06 22:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d92d692122dec727e92cbb31217da2d1 SHA-1: d1c7d07e9ee9c55ad344330445aed84c6c1dc010 SHA-256: 9b40915fdef13fdabf7dc0b8a376b3fd8141ea2a39e60efd6bc8c532afa69dab
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to various websites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/award?keyword=how+to+program+cox+remote+urc-8820-cisco PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd9d8ddb5584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fc8cfa297908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5fcc031619b8e.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/hicjidx/80706469540.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/dudewawi_vizesukitipogow_wavasobetu_rewuga.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/3181136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6021a21e6611a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_603fd99656f24.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/ePzjb7t/valkyrie_profile_lenneth_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_6019ab8c8729a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5fe32ddb32f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_6038fc3b784be.pdfIn PDF document text
    • https://lekixusa.weebly.com/uploads/1/3/0/7/130776254/nikuruk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_602d02a944958.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/guligitifek-kodin-nakiw-nizezunima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fe53038396c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fc71cc340f22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ff7cc9f9bbfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a5355a-fea8-4d19-91b1-13ad49ce2f96/religious_imagery_in_romeo_and_juliet_act_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e76f09-8f00-47b4-b1ef-5cade7929102/xoreruvutalimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ab005c-8f04-4d09-89ba-571ef5b0edda/74614147518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4bc6b16-4630-404c-a6cd-e843edd9650c/how_to_write_a_news_lead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef744dc5-3987-467b-8830-b4eb7fc1c34c/92444118209.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_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 5840 bytes
SHA-256: 695bb885ca05d3109451ae817db553212e590fef9f28842a81ffdf10c187e389
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 14992 bytes
SHA-256: 29401f1f89c2a7d9b4df4174db0187d2c2fa570e5a5716a961ded501d3a04d9f