Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb8f68425de6064…

MALICIOUS

PDF

65.9 KB Created: 2021-03-03 11:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: decc3840739a33912ec3d5083b7b783f SHA-1: ee3bbb5c872386a18992b22d6d85433982a9f364 SHA-256: 9eb8f68425de60646a504a773f7f7671fb5305acf4586cb23f6fa3544e79ba6b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs that redirect to known malicious or disposable hosting domains, indicating a phishing or malware distribution scheme. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://dafemum.ru/wix?keyword=who%2527s+afraid+of+virginia+woolf+pdf+download In PDF document text
    • http://fixmarker.fun/40353517452cmkl3.pdfIn PDF document text
    • http://persequen.com/alliance_guns_of_gloryj4zer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5fd0f8d4394b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_603b298a968ea.pdfIn PDF document text
    • http://tosety.xyz/naropacxcl5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6033a3b89252a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456705/normal_5fc867f8d013e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fded4b949650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5fd3226c067c8.pdfIn PDF document text
    • http://it50disconto.pro/vinazatupifumolekejaxhew9x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_602586e6e285a.pdfIn PDF document text
    • http://stickerrus.ru/blowin_in_the_wind_songzeqdy.pdfIn PDF document text
    • http://girlsbeach.space/process_essay_example_cookinghlsxh.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/lakadutof/22850807899.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_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 5504 bytes
SHA-256: 76923596c54934c16ce987888f5495a74554d3d97aba0a8f9248d0e8a5ca679c
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 9992 bytes
SHA-256: f38a33d21c973d00d4970fb3db01b21335081b6b0d5d3d1421ac8370ee97f19b

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