Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c5dae141117eee…

MALICIOUS

PDF

74.1 KB Created: 2021-02-17 14:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c1c0e7ae5698229f49057a3043416811 SHA-1: 4827cc723081a87a5b8e871325ffd296a7cb82e6 SHA-256: 75c5dae141117eee47c307eff97db89fafcde2b085f84efdf426d955f5627afd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to search queries. The presence of numerous links on disposable hosting and a link to a known malicious redirector strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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://yafferge.ru/strik?utm_term=how+many+carbs+in+a+sonic+burger+without+bun In PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/8237419.pdfIn PDF document text
    • https://norenepativen.weebly.com/uploads/1/3/4/3/134315866/7256788.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwibibowow/hihd87E/46519502549.pdfIn PDF document text
    • http://ijmalan.xyz/jipunuvurejujawavusufec2mf.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/boxataxumi-refevu-widugadejozoten.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/cd6c35ac.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/wVia2XN/kufajawana.pdfIn PDF document text
    • http://creditinquiry.info/all_of_me_karaoke0wenq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_600ca5cf2f979.pdfIn PDF document text
    • https://zexebofefibem.weebly.com/uploads/1/3/5/3/135303963/cd80fc768e22.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/No6Mjb5/74805466543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449181/normal_5fcc34c2e7c9d.pdfIn PDF document text
    • https://wovuwujofisup.weebly.com/uploads/1/3/1/8/131856276/luxanutigox-wegabufapez-vevisawosopup-tedudepez.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/djfTghD/tawevilapitubulora.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/h5Mejeg/phase_10_card_game_near_me.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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 5476 bytes
SHA-256: 4c196db642f7b757e08b30798b369996d3049b95d53a1657843b517c5701d379
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 11600 bytes
SHA-256: 0e8aa59e6eaed4601add469bb982229d276666006347c2c2f27be59fef2ce066

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