Malicious PDF — malware analysis report

Static analysis result for SHA-256 8666b450d381708c…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 07:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4e1939fcacd2d54953b0371e79ed51c3 SHA-1: 04f00510bcfbcb0fecd5a6d3ed1c924f3d7cec41 SHA-256: 8666b450d381708caaa8328ea42aa16341e0dcaf0bab357ef66d046cc8bb7511
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external, potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The presence of external URIs suggests an attempt to redirect the user to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/wix?keyword=texture+packs+minecraft+1.5+2+unblocked PDF link annotation
    • http://nekidifuton.medianewsonline.com/ansys_fluent_15_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_603038996d4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd9d09817c2c.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/ghaxgcq/modern_sniper_history_channel.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/ipcc_audit_summary_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_6007565f0c14c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_604d312ed10da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_6047f10f52a7b.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/ZQ5gcFz/bts_dna_instrumental_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/Bhcuodc/kuvilewugonegilokefepax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5fdd42f403ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_601b424aa693d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403422/normal_5fc8f92fbd545.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/how_to_make_a_groundwater_flow_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_5ff5494d0f396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_600ae03985f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_604647fe344be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_b985f6a7fbda47b2852568dabd5fa21e.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_9a0a1dc12bb14a9784136ddae8bd15d4.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_8c5495dfb27b44aa89e955b1059514a6.pdf?index=trueIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/how_do_u_describe_a_rainbow.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_03a985c8797b473eb350378f383e43c6.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_de8aa631edf84f84b449d7060b02ca2a.pdf?index=trueIn 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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 5864 bytes
SHA-256: 3b2b1bf7227fe60e9580a780dc9d5abc51c9bb1da20ea9431c960c0fb61dfa44
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10628 bytes
SHA-256: 668129e9e6f1291809b4ca8cc526e2f9bed8cc9a6fd2b650c515595265ffce43

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