Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ae49db4a6458d2…

MALICIOUS

PDF

78.4 KB Created: 2021-03-11 06:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e9cf0899d2b42a5bb4a09c926d11d3f SHA-1: 1d763b0294bc80db202cdc8f79101b350039917b SHA-256: 86ae49db4a6458d214fea8da3e91c5e265dd77a46fe137c2d1ca8c098944c08c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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
  • 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://golowaki.ru/123?utm_term=cookie+sheet+vs+glass+pan
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/102df959d27e84.pdf
    • https://cdn.sqhk.co/xanodujijefu/haHifha/xokamevafag.pdf
    • https://static.s123-cdn-static.com/uploads/4496816/normal_60086b3f7a85e.pdf
    • https://cdn-cms.f-static.net/uploads/4474720/normal_5fd14cf94473d.pdf
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/801f42.pdf
    • http://jelesanu.iblogger.org/ashoka_full_movie_hd.pdf
    • https://cdn.sqhk.co/lilomovetum/iaKPkwh/gebasoxepaditatimekapoli.pdf
    • https://cdn-cms.f-static.net/uploads/4417986/normal_6016774d6136b.pdf
    • https://batoxomaziforu.weebly.com/uploads/1/3/4/7/134708014/5911670.pdf
    • https://static.s123-cdn-static.com/uploads/4451047/normal_6005419883b61.pdf
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5fe102aa0d2a6.pdf
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fdfdc2a53db8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zibinafo.rf.gd/gitanokotafukadizam.pdf
    • https://uploads.strikinglycdn.com/files/9c902708-39cd-4960-873d-44e405e29b3b/how_to_set_up_voicemail_on_panasonic_kx-dt343.pdf
    • http://lejibop.rf.gd/56615204699.pdf
    • https://uploads.strikinglycdn.com/files/379aa401-087e-438e-8f2b-e4a039ff36d2/manual_de_primeros_auxilios_2019_peru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87b.bin
3403726d7466ae1ffed28e01705fece70a985e42df5e98d9b302f29d6cef0133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 4920 bytes
font_01_sfnt_off0000f93f.bin
d7d9014576c3e5b90fd624881205e96aacc3803b27ad759c016d9cfe9e3376d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 11024 bytes
font_02_sfnt_off00011e93.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 4324 bytes

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