Malicious PDF — malware analysis report

Static analysis result for SHA-256 897382873018aa08…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 22:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c810ebe093a054ac15fe424f71305e8e SHA-1: a17f8e416716253520e36ffaa1778abc794f00c1 SHA-256: 897382873018aa08307c15f175b1851a7a6d9eadb3e43ee689c73b39e301cde6
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=electron+dot+structure+worksheet+with+answers In PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/5871177.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/Vhdjjhf/amazon_kindle_books_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_5ff0ed33c5924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5ff44dd75ea93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5ff85df41ae49.pdfIn PDF document text
    • http://4gusevshop.website/39590339509nvfpy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_601aaeed1bb8a.pdfIn PDF document text
    • https://wenutezow.weebly.com/uploads/1/3/5/4/135400756/8023736.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/xigt3jh/play_triominos_online.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/d42f6152e02e8e.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/tenuw.pdfIn PDF document text
    • http://fakaripeti.xyz/37265341409g8dyy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_60272a52a0908.pdfIn PDF document text
    • http://help-igcopyright.xyz/tofosujuvitukat79cky.pdfIn PDF document text
    • http://songkfrk.site/trending_whatsapp_status_video_download_sharechat_telugud6b8x.pdfIn PDF document text
    • https://tovorugezix.weebly.com/uploads/1/3/4/5/134599805/zulilate_seveg_zozevinopoti.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/hekhjhj/10603139664.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/pobixedele/kmcc5015gss_spec_sheet.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_fe1fd13334d446d6b8b496d1941b8be4.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_650c547ef5714ef9b53ee36cde7c1d49.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_9cbc852ea0c648309b7ca8d965c1aaff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/celtx_for_mac_os_x_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/tefiz.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_cd7fe33a154e4ee58bd4300a83232c5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/21218525437.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/doge_s_palace_guided_tour_tickets.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_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5140 bytes
SHA-256: 81466c10ec4f345b2961a73db989457c99f9a313a0b4e33cfcb3fb2b270a73cc
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10796 bytes
SHA-256: 84c743ef7e8ad95ffb6b76996ee24e30790777bce8e20d5a6d92f58d94d4d2d6