Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18021a7710b5ea2…

MALICIOUS

PDF

59.5 KB Created: 2021-01-17 02:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 929658c846d4db408867a98ddc45568e SHA-1: b5a00af857a3d8741c01dc0ff4f5da782171b823 SHA-256: f18021a7710b5ea2b53e233de855910c491cc2511f7f0638dc4e9fdfb93079af
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable one being traffset.ru, suggesting it is part of a link farm designed to redirect users. The presence of multiple disposable hosts and UTM parameters further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=lowes+dog+kennel+panel PDF link annotation
    • https://site-1178934.mozfiles.com/files/1178934/hashtag_finder_tool.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/wobixutivazur.pdfIn PDF document text
    • https://site-1171568.mozfiles.com/files/1171568/mewokokibaxowujawixodux.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/linear_equation_calculator_soup.pdfIn PDF document text
    • https://site-1166710.mozfiles.com/files/1166710/muay_thai_2_fighting_clash.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_5fae4edb2962b.pdfIn PDF document text
    • https://site-1216802.mozfiles.com/files/1216802/83774986121.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/hc0L9I3/jafawaguwawodojifeviwik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405638/normal_5fe5975f30fa4.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/jagux/apache_poi_template_xls.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/77775901928.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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 5128 bytes
SHA-256: 24d476a12105e6fde067e02219f6309ac986ebd23d0fb22a6366612c63a16ff6
font_01_sfnt_off0000c121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC121 9532 bytes
SHA-256: 78535af373a541ab376ac402f485a17fdf35f8222b63001a6885bc1eba29a971

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