Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d991710cc6cee33…

MALICIOUS

PDF

76.5 KB Created: 2021-04-18 11:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 36676e9b72ec73520f3e70b1fa6f463a SHA-1: 2f6f24b5e062f93eef74db8dcb63ef281b08e21f SHA-256: 9d991710cc6cee331131106423a7c3366edfe74d74f3a042895213bfebddd7a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

The PDF contains a heuristic indicating a mass external link farm and a ML classifier flagged it as malicious. It also contains an embedded URL pointing to a suspicious domain, likely intended for phishing or malware distribution. The presence of a 'Security software disable instruction' heuristic further indicates malicious intent, suggesting the document aims to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://bologen.ru/strik?utm_term=how+to+put+a+gateway+into+bridge+mode PDF link annotation
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/60c258e3dc1d.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/gixiwe_susojojed_rabilidib_raxeg.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/bLXrOhj/edge_lighting_effect.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/3jgcWjc/34953448305.pdfIn PDF document text
    • https://cdn.sqhk.co/pubusudes/jbed3hi/mario_game_gallery_dos_online.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/TfgnEgi/88782591728.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/girilifawuxi/bhagavad_gita_chapter_15_in_gujarati.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_a5f3eb775f5240fa81dd48d05f2c70b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/aapl_quarterly_earnings_report.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/bostitch_sb-1850bn_wont_fire.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/zizavokubonevaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/67008697768.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_e265f41cdf954e4bb708e868fe85f2a5.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_d314d27fb2ce4afa82330df0be56329e.pdf?index=trueIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_e7730bea63344bc7abfd78d4a7c8d616.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_388cfd27eab140419c97cee95174c3ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wejuvono/cdcr_form_106.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/2809662631.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_3b9de3448f6447bab567d670728aedbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purawuma/la_java_des_bombes_atomiques_partition.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_7aa467425ad84a7db9c3aaddade7ff68.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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 5364 bytes
SHA-256: f0bb1fcedd50b8a835245a17bd3253845b6029720a9ff5e08b81821553814541
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 11380 bytes
SHA-256: b63cb457fc11e5df7ce21c80280aeec3e36f5b33e53eec1a367a528b2120542a

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