Malicious PDF — malware analysis report

Static analysis result for SHA-256 e668cab9652617ef…

MALICIOUS

PDF

86.4 KB Created: 2021-03-09 12:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eb82e23a86b3a6b560b613eac3bac229 SHA-1: 7799b18bdf8e7630eef92592a0a24311682807f3 SHA-256: e668cab9652617ef69cf81bc33c9fd668f8f2b3777cfc4f9cb12e5f3aa099931
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to distribute further payloads. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

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://resalured.ru/award?keyword=ucc+admission+list+2020+20+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5fd9b4e420f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_603afb17b701d.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/8785775.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/edGhzij/47503090746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_6037c33e7a010.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/jtOSQid/soccer_stars_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_601b772fde522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5ff5ef5d56c04.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/bHidcfJ/pudusumitabokemukuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_6021236066e80.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/2643591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_60152f866a540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5fd8ea2562fc9.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/dopuwepedid_namegok_xubema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_8fc5d4b702fa4fd7b22db2476d0f4790.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_75e3e6a1c47948cc8bcdad27da0be87b.pdf?index=trueIn PDF document text
    • http://debumiputun.rf.gd/jodaremasosuwogikegevog.pdfIn PDF document text
    • http://tetejesuwune.epizy.com/php_html_to_with_css.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_ceeac768d6514302a7f24497667b5602.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 5472 bytes
SHA-256: 88e245e9c5b441ac5dbf4261ef940aedcde5d2313cf2e9e636bd059566a9b418
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 14204 bytes
SHA-256: 6b3a7432097020e0ad10fc0feaf1bf43aa7aa4b2c345fd5656e4b85b4ecf54a1

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