Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e12b7257bd08165…

MALICIOUS

PDF

115.1 KB Created: 2021-03-20 09:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eb2c31f8ab1de590d77400917c30400f SHA-1: fbad68d499214419db3dd33d999468ceb931ce42 SHA-256: 2e12b7257bd081654988588215fedd565c482338668d5adbbeaab402bb9666ba
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external links, forming a link farm hosted on disposable infrastructure, which is a common tactic for phishing or distributing further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=barlow+condensed+light In PDF document text
    • https://cdn.sqhk.co/ralapogifur/ieaO4ZO/60792939143.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/0gcihfb/19349499653.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/MJa8Cha/visual_studio_code_login_github.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/Cdhjh99/rutejaze.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/ajgIhjd/steven_universe_amino_pt_br.pdfIn PDF document text
    • http://gayerkan.com/36574312102jltpa.pdfIn PDF document text
    • http://gazzsheff.xyz/html_form_post_radio_button_valuebcu0q.pdfIn PDF document text
    • http://naturfresh.fun/nuzumevisebekhd37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_afa4bbd1ddfb4134a795d5a0bde99999.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_d21e3059d22b46b7aa0533bae17100c8.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_b6c6a16ac86948959b41a2eeebdcb77e.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_7b34a0dc116f4f8b9c7c3697cd0e86f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/76018263024.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_54b520cbc43b48d28277b17498388996.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/68467190272.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_c21b9799a7384516b7d00e551ddb4175.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_9959f23c08bc46989e6fd41f79c6c15e.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_1d13947bf36b47e3a6504c1f20d911d1.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_81d6a36cd14243a885ab9c0acec96c5e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 5128 bytes
SHA-256: 6aa29f995dd852b4582af23ab1bd97ceacb5c7f7f6b590a6209269ba1537e003
font_01_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 67848 bytes
SHA-256: e034f5b86d650cc0a76dfa90b384f5091a8484e453421f3645fb6d4c200bd953
font_02_sfnt_off000198ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198AD 16820 bytes
SHA-256: 008ca1b5cb9bc9912a3d01c7ff55347e2d4ba6586cbdf2d3d0a66cb230e49f65
font_03_sfnt_off0001b076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B076 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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