Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05bfc1e12e97098…

MALICIOUS

PDF

79.3 KB Created: 2021-03-07 01:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7b9730a5bd43d7beecb7db08aaa18182 SHA-1: a4db3160ed005158e6c1284f4996af079c192950 SHA-256: a05bfc1e12e97098376935419ca62c90d7529e4727f7b9e00724e9dbf63d5a47
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of malicious links suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=how+to+change+furnace+inducer+motor In PDF document text
    • http://lozejebivo.scienceontheweb.net/introduction_to_finite_element_analysis_using_solidworks_simulation_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468536/normal_5fcf12880b2c2.pdfIn PDF document text
    • http://hs-life.ru/ruger_air_hawk_parts_diagramo2ewr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_60080e93928cf.pdfIn PDF document text
    • http://avit0.cc/6874481227439l8j.pdfIn PDF document text
    • http://tizezs.xyz/total_quartz_5000_price_in_nigeriajrc5p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_6020a73f1d704.pdfIn PDF document text
    • http://cosmeteca.com/1mg_etizolam_trip_report600ne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_5fd98954ed895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467032/normal_5fe0c1c6d064b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_602e3516d67cb.pdfIn PDF document text
    • http://capridigi.com/9702313798347ku4.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/the_childrens_book_of_virtues_by_william_bennett.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_c0586d66c1a04c19b2c0351ccf86db49.pdf?index=trueIn PDF document text
    • http://susabumo.atwebpages.com/3109713941.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_24be9c480efa45bdaa665ca80344df0b.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_5a0f65eb05354be8a5489d377dcc4320.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_f18625aa032e466ea1865a8307e18fb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/autism_information_in_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/wedding_invitation_video_maker_templates_free.pdfIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_ba36ea3b349f4e89acc6ebb250570e1d.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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 5276 bytes
SHA-256: 732faab71eb7c749b8a8df1925c7251c116ab0f9a66eefd634ee163242ab6d9d
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10524 bytes
SHA-256: 564259c0dfe6d67b1a6c257449ff29d8ec68b00b4d6fe4daf8d4d68b233be19c

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