Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39444530618fee9…

MALICIOUS

PDF

73.0 KB Created: 2021-03-04 18:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67b5faad21f7fc5cb404fd68b4b576f7 SHA-1: 2a6625c579d096091b23f86d63fc8ab01616f955 SHA-256: c39444530618fee921c745d0527b2e132c8afa2f51286e23c125d7a13b519ddf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection strategy. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing or malicious content delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=bicycle+transit+systems+los+angeles+office
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/tajora.pdf
    • http://tapadobav.iblogger.org/45067093682.pdf
    • http://scrlt.xyz/sims_4_lunar_zodiac_challenge7iuxi.pdf
    • http://vivekawiga.sportsontheweb.net/zanawariranatedogev.pdf
    • http://fionainthefield.org/bijadelulx68wv.pdf
    • http://wspring.space/206132502549qedd.pdf
    • http://kapovulup.mywebcommunity.org/16772742210.pdf
    • http://fijexojor.getenjoyment.net/26344374932.pdf
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/8177760.pdf
    • http://timelessdecorum.com/29742988877n3h5o.pdf
    • https://dosijusesuxola.weebly.com/uploads/1/3/4/3/134305349/33567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vabemavuputenif/lefokixibar.pdf
    • https://s3.amazonaws.com/palevijuj/occupational_health_and_safety_training_for_employees.pdf
    • https://s3.amazonaws.com/vexosafugunu/pdf_file_reducer_offline.pdf
    • https://s3.amazonaws.com/zuses/blank_space_video_free.pdf
    • http://puzuzebud.epizy.com/ipcc_5th_report_summary_for_policymakers.pdf
    • http://pasigajixivete.epizy.com/anemia_drepanoctica_o_de_clulas_falciformes.pdf
    • http://pilulozames.epizy.com/guide_rail_system.pdf
    • https://s3.amazonaws.com/zunewidimem/lagupapudakubesitegade.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_off0000d2ee.bin
49e083b50ecfb90e411ff1a7eef7d127e61a707bfce2fb5d86bcee05ff211657		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 5140 bytes
font_01_sfnt_off0000e44d.bin
fa83debab2c72b88e709ca0ed4ba76b81ec3b088ec2747fa4c9afe7ca1f8b25b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 10512 bytes
font_02_sfnt_off00010815.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 4324 bytes

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