Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc87c2b57d5b6cb…

MALICIOUS

PDF

99.4 KB Created: 2021-03-20 14:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a6dfa491bf2ebd2e74a850e3ee7602e SHA-1: 27cc499eb9328c9d175e498e8436ff49cdaf4b11 SHA-256: bdc87c2b57d5b6cb3e7ad73c31242e6d3c84b6e86c787a6a361c67ae17656a54
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=visual+basic+for+applications+tutorial+word PDF link annotation
    • https://duvetuxivana.weebly.com/uploads/1/3/3/9/133999993/2394782.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/cQhfLpf/rip_math_education_and_learning_death_funerals_module.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/hqdgeje/73738927607.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/ei4icha/64077275695.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/6f270781db9d.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/mudig_danewiladab_matuwe_kibubofe.pdfIn PDF document text
    • http://banepudota.iblogger.org/55297474294.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/dRhfjjT/witcher_3_crafting_materials_worth_keeping.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_5ff4d609958b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5fca5a41e43b0.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/wolawatin/47163761810.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/discrete_mathematical_structures_with_applications_to_computer_science_tata_mcgraw_hill.pdfIn PDF document text
    • http://nadejakajepog.epizy.com/annuity_due_sample_problems_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/android_auto_not_working_in_car.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/smeda_feasibility_report_for_youth_loan.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/nitodubesiwigupapebaji.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/nedowosidosa.pdfIn PDF document text
    • http://zepedijuva.epizy.com/rotugokobasivulebumi.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/riesgo_y_presupuesto_de_capital.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/samsung_s5_mini_daten_auf_pc_bertragen.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 5348 bytes
SHA-256: 165eecad512720c695ff44d3ad40fd8d5aee2beb1698e1101fd047d5aea0c438
font_01_sfnt_off00014522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14522 11024 bytes
SHA-256: 1f92fd41657c0f607b15d76ee1a75b5eb77e78d0b34768d97419fabe27d08cf3
font_02_sfnt_off00016aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEA 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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