Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1eb4ef49d38e27…

MALICIOUS

PDF

73.3 KB Created: 2021-06-08 21:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9514fc5df9160545059a91ed0ac2eba3 SHA-1: 5bda701704d50247a61af39ca5e7646361a92aea SHA-256: cd1eb4ef49d38e279e85453672f93b1fa29c526324c23bfcda23547b39020b04
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'Kindergarten 2 download android'. The presence of a large number of external links, including one to 'wastran.ru', points towards a phishing or SEO-based malicious distribution scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/pbw?utm_term=kindergarten+2+download+android PDF link annotation
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/a8e0aff13f510.pdfIn PDF document text
    • https://sijidipej.weebly.com/uploads/1/3/4/4/134483730/taroge.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/dizetaporenakidazow.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/4695919.pdfIn PDF document text
    • https://mevonupimiluge.weebly.com/uploads/1/3/4/5/134527198/391431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf70e79a-54f8-4b5f-9970-520bcfcafcdb/dyson_dc58_battery_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bed957-09a2-49f2-a262-fc7658eaa6bc/georges_marvellous_medicine_activities_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1bbd19-96fe-4c4f-88d6-c1dfb9ff2595/34839321600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0acfcfd6-c00f-4168-9d54-41834ba93352/trig_reduction_formula_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53707db-e7ed-4a9f-84e4-ad7fd3997600/farberware_pressure_cooker_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65826789-acbc-40a3-85f3-8e7d1c9b2e1a/pakewumomiregefuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6999cd9-67ef-46d9-863c-0444ae42cfd8/resumen_de_tus_zonas_erroneas_capitulo_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00027001-1e08-4a1b-aac8-12ab34d0f06c/intex_pool_saltwater_system_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19cf19e-b2f9-4a34-ba14-e20568889a85/dikemivoveduvanib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bc0b27-81ef-4e64-93bf-e79d61d6e8a5/examples_of_active_and_passive_voice_in_present_perfect_progressive_tense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc44617-f2dc-4090-89bd-d71a9114fdbc/historia_de_la_pasteleria_italiana_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77b0929-b151-49cb-880d-255d12186a9a/60077285833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75898db0-4987-4d55-a981-9899a90e33f3/how_to_reset_uniden_bc125at.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_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 5008 bytes
SHA-256: b01819599f22b5ff31b27a9975a009058bcc22e837924c8dba511c924345ffb7
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10192 bytes
SHA-256: 120f7754e5842882c84a5b342bca561254775924b99405ad71dad2695cfaa1df

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