Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0895aec6bc359c…

MALICIOUS

PDF

164.1 KB Created: 2021-03-19 09:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b175b872bb336121e6bb10ade8488f3 SHA-1: b8f77e03b693b634b1c428acd30fe7659427a8fc SHA-256: ec0895aec6bc359cbfa1a75f6175a9f6aeb9760e7bda6332ee9fb10a46952fdb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=diary+of+a+wimpy+kid+double+down+pdf+yumpu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411923/normal_5ffe8a62a5d1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424347/normal_5fe118011370e.pdfIn PDF document text
    • http://pemegira.22web.org/vibevifujutivigifu.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/bovisenenuwizevetulotig.pdfIn PDF document text
    • http://xipuxolidumix.22web.org/git_commands_list_github.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/random_sampling_definition_in_research.pdfIn PDF document text
    • http://fovagenifozemub.iblogger.org/ruzuzav.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/data_structures_in_cpp_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_604004e029d88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futotodogedujox.epizy.com/38108790228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd387014-72f5-4650-a37e-32b5dded5589/habits_of_mind_posters.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/rolupuwup.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/8156053652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d51f33-1b3e-47e6-90a6-0835d133deec/70383687527.pdfIn PDF document text
    • http://wipupagajefi.rf.gd/venilefatojejutosumimu.pdfIn PDF document text
    • http://xazikipigenuvi.rf.gd/income_guidelines_for_wic_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7006c8-43cb-40a9-926e-1ee2ccc025a5/lobawel.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_off00024886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24886 5404 bytes
SHA-256: 3505079ac7f8dec4c376736bc155270e73d478812478045651b7c3216cc8f96f
font_01_sfnt_off00025af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25AF5 11684 bytes
SHA-256: b99d70eb7f87839b7a19267c71cbb81fd455648049f1f7278bbd48432a1b7c53

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