Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a1b2d018166b48…

MALICIOUS

PDF

75.2 KB Created: 2021-01-23 13:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: abdb7e265689677c0620d77695e32b29 SHA-1: 7ae9ce2fc2244d12de37abe8cd49695c4c34ed98 SHA-256: 38a1b2d018166b4834553716e2d3cd294dd2ec20c0dc661752a4e641b465c97e
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL 'https://jacksth.ru/aws?utm_term=direct+and+reported+speech+lesson+plan' is the primary indicator of the attack pattern, likely serving as a lure to a phishing or malware distribution site.

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://jacksth.ru/aws?utm_term=direct+and+reported+speech+lesson+plan PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446647/normal_5fcf7061e7837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_5fe6be8a6c939.pdfIn PDF document text
    • https://site-1172155.mozfiles.com/files/1172155/tubuzadobipipokaduxomom.pdfIn PDF document text
    • https://site-1168430.mozfiles.com/files/1168430/kick_the_buddy_free_app.pdfIn PDF document text
    • https://site-1174576.mozfiles.com/files/1174576/8848246899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5ff28fe49b292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5ff0057153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_5fec0938cf934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446921/normal_5ff17be4dc263.pdfIn PDF document text
    • https://site-1171615.mozfiles.com/files/1171615/jetikabimub.pdfIn PDF document text
    • https://site-1171150.mozfiles.com/files/1171150/national_geographic_traveler_magazine_archives.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_600bc75ace4ca.pdfIn PDF document text
    • https://site-1177929.mozfiles.com/files/1177929/ballz_game_online_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5ffe4b40e7021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/sojibu.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/answering_machine_detection_configuration_asterisk.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/7219002585.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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 5160 bytes
SHA-256: 617976cac2b7c01122d876d9a97f66d6e4b5107aebb9d8d1b2fb022b4916fdb1
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 10468 bytes
SHA-256: f5e21de64dad322591750bbb27e08de23e2c4099ed10f86332deea4bdfd5d1f8

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