Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c630a20fb1f00b…

MALICIOUS

PDF

85.5 KB Created: 2021-03-04 10:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 671663788a5c8eb2330717b9c87d9a5f SHA-1: e551fe8a4d05f18b8973d5f304226ab6bf81b014 SHA-256: c0c630a20fb1f00bbaae16c511843e24f4e9e64cdbb28855ed49bcb60b61afee
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF's structure indicate it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dugedepap.ru/award?keyword=code+name+verity+book+summary PDF link annotation
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/morimof.pdfIn PDF document text
    • http://gratoraama.space/forgotten_realms_campaign_setting_bookjv46j.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/why_was_the_year_1876_important.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/reading_comprehension_worksheets_for_2nd_grade_online.pdfIn PDF document text
    • https://tivenudonokokom.weebly.com/uploads/1/3/0/9/130969369/xezokoropad-fubirafe.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/facial_diagnosis_of_cell_salt_deficiencies_a_users_guide.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/until_friday_night_age_rating.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/283987.pdfIn PDF document text
    • https://nibawisid.weebly.com/uploads/1/3/1/0/131071209/6201594.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/taturi/dojopipeligex.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/zakosoxafuxapagi.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/nebesazozipasawenatig.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/granite_formica_sheet.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_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 5212 bytes
SHA-256: 6af615ed0deed55de25ae3d85f0a3b28c874f0cba38d262778c9042233cc63bb
font_01_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 10900 bytes
SHA-256: 3c4f49a76d6203e57f55444a07953925433a84253e35ce3c4996b9b3418b54fe

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