Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c074ee1e3c8fb80…

MALICIOUS

PDF

76.2 KB Created: 2021-01-09 20:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 157d5dd418d1600c64d59efb580a6964 SHA-1: b164a7a80af20aa8c6cc09a2cce2dc81734a78d6 SHA-256: 4c074ee1e3c8fb801c84c7ac214935cc153f961e4ea550c3f34f6fa857950ede
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, contains text related to factoring quadratic expressions, likely a lure to disguise the malicious intent. The primary attack pattern involves directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/square?utm_term=practice+5.+3+factoring+quadratic+expressions+answers In PDF document text
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/bedowowux-gelikiwejimun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fc86e7210389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5fe1920d8d08f.pdfIn PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/b752cc003068a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5fb56fc27d5cf.pdfIn PDF document text
    • https://cdn.sqhk.co/fezemepusap/gi9dYgj/8021152681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fb82ba3de9b4.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/giekyWy/luxury_car_racing_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jggPWgg/baixar_arc_browser_apk_free.pdfIn PDF document text
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/terivalukumi-fereduma-savuviru-nasijakok.pdfIn PDF document text
    • https://pexevirojaloko.weebly.com/uploads/1/3/4/8/134882405/xixiriduxofokemu.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/dajdia0/wukisedokesokojajeril.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://s3.amazonaws.com/vufuzewasi/kikosas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 5780 bytes
SHA-256: 0d4664e1854b24979e60f294925f3099a388d1baad4cc4bcde88b07b90960590
font_01_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 12356 bytes
SHA-256: 2997f654e8e31c5b802f879dba223c4eda91649bcfb9af07f04606f9e11ffaa0
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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