Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c184381cc56187…

MALICIOUS

PDF

90.3 KB Created: 2021-04-05 04:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bff25ce502e6d5f5ad55c7d93e2c71e8 SHA-1: 2c0c7626339c92ce06e4e1c8ad908d8f1651733c SHA-256: b0c184381cc5618707b6e02c12b0da2438bffdcae658ce268b29c075f79b1e18
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of embedded external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary URL observed is https://xajibur.ru/aws?utm_term=can+you+change+the+value+of+an+ace+in+blackjack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xajibur.ru/aws?utm_term=can+you+change+the+value+of+an+ace+in+blackjack PDF link annotation
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/gafubozar.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/iiIific/lutiv.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/1361966.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/S9Shezj/simple_present_tense_exercises_advanced_level.pdfIn PDF document text
    • https://cdn.sqhk.co/rajosibakulu/bUP1hio/80651499616.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/dhdhcvQ/zopozozenikavunivosim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_3f2dd0907cdc4c5ba69dea14c6b6ee66.pdf?index=trueIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_b474f59e43d14cafa03827634d6e8b9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7257720f-02c5-4742-a950-28ff448ab6bc/cuanto_es_1_8_de_pulgada_en_cm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0d8291-0de0-4720-90d0-1f91c664c601/26817113522.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_f822febfce4f4a818079441283d07888.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/debipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41897ac8-d314-4e57-b00c-884333bfddad/ford_mustang_shelby_gt500_for_sale_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/phet_simulations_bending_light_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/bastarda_font_free.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_f0aecf8f5c4443cc9da0e148bc32c16a.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_4117ea291b1c41dab2d684d66de1cf23.pdf?index=trueIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_1a4fde7c0d004cc2b4f05d52b4e54082.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/food_blog_design_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d56529-0ca1-433a-8ca3-25c39e2119f2/how_to_test_outstanding_checks.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/ser_bachiller_2018.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_554e850c67064e3281e64118ee455620.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_990b19a333e64cd9a641ee70dd18dfbc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 5216 bytes
SHA-256: cdc63500f063f832db13c6fa901f2d930116f14d56fc592cd255e17cf7f9fa2b
font_01_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10792 bytes
SHA-256: 7c3ecc52f4efafbfb46e2294d6ca3a8b29105adedd556ca27415a5e2b1cc4d76
font_02_sfnt_off00014b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c