Malicious PDF — malware analysis report

Static analysis result for SHA-256 474a0e9a30bdf5a9…

MALICIOUS

PDF

73.0 KB Created: 2020-12-23 12:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 003c1b461afcd5841898d3d9866670ca SHA-1: 911cc910a7832622a63dee0d017fdd49edfe87c0 SHA-256: 474a0e9a30bdf5a9a59d90179bbac46239f62c82d8a98516122e6d935a48a05f
156 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 0.9997

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 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.
  • 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://traffset.ru/strik?utm_term=hollywood+stunts+movie+star PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f875b353f838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fa647a274570.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/vibox-maworadogineka-limudevuxapova-gewapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5fcd40534a43d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff7920f-fb10-468f-8329-d08ffdfbfbee/one_piece_episode_875_english_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/storytelling_with_data_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/dazugefotoporine.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/alexei_sayle_sandwich_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/british_english_speaking_app_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d00e405d5340f3291e5b/t/5fc1e7819ee0f32b8797dec7/1606543236860/8413434103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96fd27e-fbb1-4e35-bf33-07fefe045311/88077926820.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 5184 bytes
SHA-256: 6d8b5fb72bdea3dedfea00aec0cdcfbf751edf54e7efbc7a4b298a6c8944d9ed
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10032 bytes
SHA-256: 9876478ee878b8d269950bd66f6eaf8a98e38319725c32ab90c115e3bd1b3d0b
font_02_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 18468 bytes
SHA-256: c512d9a239ccc0515ff325b601c65b67c29a6f45971fcbcb9e2584629766a774

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