Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28f9e6cd95ecb1a…

MALICIOUS

PDF

78.5 KB Created: 2021-01-29 08:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 62c01ce297f64e8d55e597ef175fa6bd SHA-1: 024398ef5249230068c20e521eb2c30fc2e22b6f SHA-256: c28f9e6cd95ecb1a78a0098ddfdf035473c871be011d4a301308323ddd52aacb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the classification as Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0 strongly suggest it is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/wb?keyword=the%20solar%20system%20the%20sun PDF link annotation
    • http://arendaavto.taxi/suwuzemijukubebusujouj8oe.pdfIn PDF document text
    • https://dixotusokor.weebly.com/uploads/1/3/0/9/130968976/bufanagugam_bavefup_gelunawevudeko_kutumepumu.pdfIn PDF document text
    • http://ewwe.space/fast_food_near_me_seafoodw5d8j.pdfIn PDF document text
    • http://scm03.ru/85853924155gtl9b.pdfIn PDF document text
    • http://swiss-gear.shop/dojezagodajoxerisurigulp2pyi.pdfIn PDF document text
    • https://tolutewegudef.weebly.com/uploads/1/3/4/0/134097468/7323646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd3da489ecca.pdfIn PDF document text
    • http://reduslimitalia.website/63118367439lqick.pdfIn PDF document text
    • http://qupieasy.online/biology_igcse_z_notesuoiz8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5feb0369c4f21.pdfIn PDF document text
    • http://milky-rp.space/19675561689a9ma.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/viwujupuneg.pdfIn PDF document text
    • http://kalavar.xyz/763565206078jvql.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffeb505e6cd0.pdfIn PDF document text
    • https://timijajuvage.weebly.com/uploads/1/3/2/6/132683040/guxagerer.pdfIn PDF document text
    • http://baltika-trans.ru/tasizokipixeginufebona4oosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fe7a1cae0450.pdfIn PDF document text
    • https://pewofofuvalok.weebly.com/uploads/1/3/0/7/130775386/zumozobulule.pdfIn PDF document text
    • http://hookup666.site/mastering_matlabitrtj.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/diwitapezu/gelato_33_grow_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/accp_2016_dvt_guidelines.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_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 4976 bytes
SHA-256: ed7ee8dd8e00c7ab9607e6a5f88484c0a24dadae3f6bde1b3a24a4fdafa1ddc0
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 10736 bytes
SHA-256: b164dcde119072cad2cc772102bb6e0588200ae6e44e6f7e857655329ba34ab7

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