Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9e91c2cc312d6e…

MALICIOUS

PDF

73.6 KB Created: 2021-01-10 05:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 36eb352f6e2331ac2579ac41e5428cbe SHA-1: 72b71d0e50d77c669081a8ea4ff43414185b749c SHA-256: dc9e91c2cc312d6e72c657531c927b47c2b95f00cb5e95621242ab3afc81b4ac
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=grammar+translation+approach+examples In PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/365c07b.pdfIn PDF document text
    • https://site-1174352.mozfiles.com/files/1174352/murenatoruj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_5fcbe5e4f33bb.pdfIn PDF document text
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/6804264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416653/normal_5fefdd662bafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5fb68597a9b34.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/pugukekixak_kilavojabakisa.pdfIn PDF document text
    • https://site-1177660.mozfiles.com/files/1177660/applocker_windows_10_gpo.pdfIn PDF document text
    • https://site-1184420.mozfiles.com/files/1184420/guvodunuretux.pdfIn PDF document text
    • https://site-1181045.mozfiles.com/files/1181045/zoderukuvofovonuketotu.pdfIn PDF document text
    • https://site-1168102.mozfiles.com/files/1168102/78026894162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5f9565e124df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5fd7faab9a02d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 5060 bytes
SHA-256: d55bcdfc08db4f8a45e602ae1b0917c2dc4d9134de7a3f645443a801fb8fd443
font_01_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 11472 bytes
SHA-256: 600582ff5cc147ce17995a88674a664b239e3d08b59c832b3bd9c1624b18be71
font_02_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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