Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a92791bd71cbb9…

MALICIOUS

PDF

71.3 KB Created: 2020-12-05 00:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3b58ec9f1dd14a4ecdee4446a1207dbb SHA-1: de9a2cba547927c9a1e62a395291286c212781c6 SHA-256: c0a92791bd71cbb9bbcbe4fd18a527274746118a9ac6c226db867ee467c3a431
176 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 QR-code 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 0.9997

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffine.ru/strik?utm_term=utah+state+construction+registry PDF link annotation
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/kobajalubuve-jukudikemi-tabutageruziwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f893698ddb35.pdfIn PDF document text
    • https://pekuwomar.weebly.com/uploads/1/3/4/5/134518408/jofosi_tonatudusoxere.pdfIn PDF document text
    • https://bajukurufutot.weebly.com/uploads/1/3/4/5/134525313/rafibeparufo-jegeletexunevem-rotorelagado-jakozugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_5faf869ab0d26.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/todidudivonedi-bimuzojoxuke-kibamabutal-dakaned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/198d2ae3-0ef4-4874-9b55-2c0838ea6511/baxeribexidajuvudajewo.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/zebutemapumi.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/46606898488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ea3bf8-3959-4741-8018-c2fbd4ef421a/utube_youtube_website_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af66011e-63a5-4791-9149-6646212c1fb3/88492687588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162bd27d-15e3-4f61-bbd1-a3d923164c91/34244140268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e023c8c-70fa-4ef3-89a4-c3f2ac1a28e1/gaxufo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 5004 bytes
SHA-256: f91039d7a6b5f51f0dc3e196cd3235aef9a6eaf5a246074269d7e83f2d483d5b
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 10192 bytes
SHA-256: f749dadfe929a388e7c5a1c045b1e4975b3d4f10ea89188dffa0570ed6498ba8
font_02_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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