Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2caa4cf0dcd2a5f…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 22:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 280ac5535d14b083e4d22902386d509e SHA-1: 98a5ab5cb47b0aa366c04eee7c5d6c1a5e26f20b SHA-256: d2caa4cf0dcd2a5fb72aec0502f39a73d27b6502c6a26001ad5b9ad50984e054
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=thinking+skills+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452386/normal_5fd7cab2174f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_60135a2846a58.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/xebonozupegesib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5ffe2249597d3.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/gekerodenavoxeremabavi.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/home_warranty_wont_replace_furnace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_603ba26c4b2e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_60303e22e0a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_6037ed8a8263d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_1981a137f9ff4b4f8d4e42249bbc4e50.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c0e993d8f1ee4cc792405dbd6b507424.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/41880987346.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_3ddedf8320fd41f8bfb528c2420b2e70.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_a0fa5e89ae8f436fb860dbd542208ef2.pdf?index=trueIn PDF document text
    • http://wokarodefi.onlinewebshop.net/44248943828.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sapolosawunamuvadulawivar.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/las_ciencias_naturales.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/risk_management_strategies_in_business.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/what_does_it_mean_when_you_dream_of_snake_chasing_you.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5148 bytes
SHA-256: 717e9ae83b892f42ba2e356dfb86636a18f751a03dfad3a3c57c7d096b444759
font_01_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 11068 bytes
SHA-256: 4a752966a8fe90290dc1e55ba7a76f7e5783f0cd237f0d865070964f957d7bab

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