Malicious PDF — malware analysis report

Static analysis result for SHA-256 db48d3759622bee3…

MALICIOUS

PDF

72.9 KB Created: 2021-01-10 07:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3b8f803b5d77e965a0a676df343b1d78 SHA-1: 16e79f52b0c9a0fc5ee09c3b2d96898d654d0188 SHA-256: db48d3759622bee3ca7a4dc31ed4450e97b54e6a751cc28a8cae8356b84d1d73
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and one heuristic specifically identifies it as a 'link farm on disposable hosting'. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URIs and the 'link farm' heuristic strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=marcadores+del+discurso+pdf PDF link annotation
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/diroru.pdfIn PDF document text
    • https://site-1178950.mozfiles.com/files/1178950/scalextric_digital_arc_pro_review.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/fiwuzupi.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/pelozi.pdfIn PDF document text
    • https://site-1176572.mozfiles.com/files/1176572/54485524855.pdfIn PDF document text
    • https://site-1191354.mozfiles.com/files/1191354/barbietm_fashion_closet_apk.pdfIn PDF document text
    • https://site-1178489.mozfiles.com/files/1178489/tileset_template_gimp.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/japixivadakosizi.pdfIn PDF document text
    • https://site-1176856.mozfiles.com/files/1176856/ziwazap.pdfIn PDF document text
    • https://refapolujagosax.weebly.com/uploads/1/3/4/8/134896756/rekidokune.pdfIn PDF document text
    • https://site-1214349.mozfiles.com/files/1214349/62189207875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fc45a915af39.pdfIn PDF document text
    • https://site-1166657.mozfiles.com/files/1166657/fallout_shelter_wiki_outfits.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/zibenoroduzuw/wunirexod.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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 5156 bytes
SHA-256: c1817e7547c595c96bcac2354b89a30ef4d2cb154955fb61c6fcc099ffe7144d
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 11712 bytes
SHA-256: 924ed005b3ec33b84ab161e6933444c6994077b1581671bca6dd8e477deb940c

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