Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbb2dce12538c22…

MALICIOUS

PDF

77.9 KB Created: 2021-03-05 17:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a203418bc7ca8cd784ecf063d09c0416 SHA-1: 2990c2d9c77bedb125e62269bbb57cfa6a9b2ed0 SHA-256: 9bbb2dce12538c222f04b2463984dd31d50e26c266060c8c20f3b409d0f66dd2
226 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. It uses a password-protected-archive lure. 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 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/wix?keyword=minecraft+bedrock+hacks+1.16 PDF link annotation
    • https://tudepaweper.weebly.com/uploads/1/3/4/6/134607512/5306579.pdfIn PDF document text
    • http://bubokap.iblogger.org/baldi_basics_android_apkpure.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/3405672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5fdd8611d42b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_600e0b0924ec1.pdfIn PDF document text
    • http://pexulabin.iblogger.org/25996147267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_601dc07e7cec2.pdfIn PDF document text
    • http://fibilif.iblogger.org/bavawawoxekagiloresog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_58764b6f7a26409eae4e421dd4ae05f2.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_898b395f2e0b4c34bf7b998e62ab0485.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_16f29da0c17e4ea0a6681f08f2785855.pdf?index=trueIn PDF document text
    • http://bilunijo.epizy.com/40164861336.pdfIn PDF document text
    • http://dovupos.epizy.com/wusitisovunipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc9e3cf-75f9-4b3a-9c98-bb562c651111/tobutusanoni.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_ab155fbbe73f4557a8d7c6c00c0f7240.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_aa5a7192d91c491fba5f3178706c4d20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc29d164-8e0f-4fa3-8ddf-7d390ceae23c/sowinomekijuvezumawire.pdfIn PDF document text
    • http://dazidotidipo.rf.gd/m_audio_fast_track_ultra_8r_driver_download_mac.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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 5524 bytes
SHA-256: 87e6aa0818d52efa0e53af89fa69653ceb3aa66dea6296e826acfe7daaecbc84
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 10412 bytes
SHA-256: ddec00ff4cc7a92641845f2db0196703fce97d6d252aad1337bbc7debfb1c367

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