Malicious PDF — malware analysis report

Static analysis result for SHA-256 12daf403ae5b20de…

MALICIOUS

PDF

71.4 KB Created: 2021-01-12 13:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 261bf7112621f74fb2dac4acdb3f5ab5 SHA-1: c00f87f0bd131db04d5ba95a3113709a1cb8e91b SHA-256: 12daf403ae5b20de4d7edbedd229a2a43eefe8aea3d129a2f7d05164ccafd83d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically advertising an 'Instagram downloader apk mod'. This lure, combined with the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier's high confidence, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct scripting was found to indicate further malicious actions beyond redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffine.ru/wb?keyword=instagram%20downloader%20apk%20mod In PDF document text
    • https://cdn.sqhk.co/puvegipuros/JrFhcGn/gorelomexawevaxuwumomi.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/birefa.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/Z2aMWqp/squishy_stress_ball_kit_instructions_compound_kings.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/22647793115.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/087716af42fb.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/eRgcejd/77087858650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5fad881142bfe.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/fumibitap_vekom_jopobukakiwife.pdfIn PDF document text
    • https://site-1177746.mozfiles.com/files/1177746/50080656418.pdfIn PDF document text
    • https://site-1178171.mozfiles.com/files/1178171/epic_race_3d_crazy_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_5ffb66280a868.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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 5372 bytes
SHA-256: 77e3693139665487102e97c2dc372ddf264b15cda14609b29ed9714d56bc0494
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 9872 bytes
SHA-256: 5f10f6eded25ad820b3412bca73a0404c5d26f292a8ccf941bbcc0e85c0d86a3

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