Malicious PDF — malware analysis report

Static analysis result for SHA-256 597df607a4f6eadf…

MALICIOUS

PDF

74.3 KB Created: 2021-01-14 17:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef924b1e98261e4001df4d90a915b04f SHA-1: b54201ad0145d3ccd4ad5d9623db6be4076c6881 SHA-256: 597df607a4f6eadfd8d49b3747d4dbd90e3ba736e23e4361063e6a90d2d4175e
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or known redirector infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=estrella+middle+school+class+schedule In PDF document text
    • https://cdn.sqhk.co/xamubana/7ide1Hy/8982089630.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/dunajugilanuk.pdfIn PDF document text
    • https://site-1180682.mozfiles.com/files/1180682/vigulurikenivusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fcd519369369.pdfIn PDF document text
    • https://site-1172728.mozfiles.com/files/1172728/81446857887.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/jagiEmn/star_wars_rebels_sequel_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/fgjTjil/seashine_adventures_cabo_san_lucas.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/giihijp/13367089635.pdfIn PDF document text
    • https://zobejonimofov.weebly.com/uploads/1/3/4/3/134354570/4450332.pdfIn PDF document text
    • https://site-1177067.mozfiles.com/files/1177067/hillsboro_drive_in_hillsboro_wi.pdfIn PDF document text
    • https://tivuwamivubi.weebly.com/uploads/1/3/5/3/135384825/1582f213fb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5faf8e8b5f779.pdfIn PDF document text
    • https://site-1216774.mozfiles.com/files/1216774/byju_s_the_learning_application.pdfIn PDF document text
    • https://povejuzulegaje.weebly.com/uploads/1/3/5/3/135301343/rimirubemuzavux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 5136 bytes
SHA-256: 20ca0d203467a7d1dafedba204553441280e5a9d4148b5049a4805c2ff79ade0
font_01_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10596 bytes
SHA-256: 401e055a60531496b9024a6a52bbb13591002d899af2d8293180a9c633413d25

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