Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c035d481fc5364c…

MALICIOUS

PDF

81.0 KB Created: 2021-03-06 13:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1c1fb7d8b342de539fd59b47a9c34c47 SHA-1: f6169bae3ec1c0f9daf859b78312e4d17a407fb2 SHA-256: 9c035d481fc5364c712b55dec51d6fa7b7eebd810da9ab5061a238f677cd46a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a mass external link farm, directing users to numerous PDF documents hosted on external sites, with one suspicious URL being https://jacksth.ru/123. This suggests a phishing or malware distribution campaign leveraging a link farm to obscure the ultimate malicious destination.

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
  • 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.
  • 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://jacksth.ru/123?utm_term=explain+the+term+rainy+season PDF link annotation
    • https://cdn.sqhk.co/jevipugirofi/iRhijaN/kazore.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/hhmie3d/13514066109.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/hjdIkVE/lost_horizon_2_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/gjUjijb/rumble_fish_sushi_scotts_valley.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/idhbPij/tetokiruduwarodujiguxe.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/uiahbgg/xejobopofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_0887f20030bc4f54ba4b809b1ee1099f.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_07f946a49f1c4bc19479694e40819927.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_f48f283613254ae3a3be95039bd7dae8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/determining_spinner_probability_worksheet_answers.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_c5397a5826e349f38eab3b15f442a778.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/rowumoxonegadopefuf.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/50169243476.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/77378716360.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/how_to_reset_jvc_kw-v130bt.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/24815154238.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/whatsapp_for_pc_without_mobile.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_0a741fec709047a4a0dd2e801b41243f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/hipaa_basic_training_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/2015_chevrolet_malibu_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/kaplan_mcat_books_used.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_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 5184 bytes
SHA-256: 9a5ff9fc3d18ac88ad2cf69cf326f98044edbc79f63c4ff9755cde5b389366fe
font_01_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 11016 bytes
SHA-256: af6e15114132a68642175883a9d1627513015578e6f5c27ccfc3ae8321fe11f6

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