Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ef494b9b73a4af…

MALICIOUS

PDF

78.7 KB Created: 2021-04-03 12:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e4edb6c2b99cbf071a94d90d4a32ef8 SHA-1: 9a4d9b8b53e577491bf004024ea0a89228e760a3 SHA-256: a7ef494b9b73a4afa315f6d2361dbcb3f4aafb131fd083f85598533c33ec6795
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 0.9997

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://dugedepap.ru/strik?utm_term=hp+deskjet+3700+wireless+setup+wizard PDF link annotation
    • http://fazupefejivujuf.iblogger.org/anemia_de_celulas_falciformes_2020.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/photosynthesis_and_cellular_respiration_worksheet_answers.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/pelijariresus.pdfIn PDF document text
    • http://xavukagidasali.iblogger.org/samsung_front_load_washing_machine_repair_manual.pdfIn PDF document text
    • http://nivunexodu.22web.org/literacy_meaning.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/gasodamuza/74324008003.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_15a9443d2d314d87b0b6020ba05dade4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/geography_quiz_questions_and_answers_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/ielts_reading_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86c3b08-528a-4b7a-985e-9c6829154c3b/85840694218.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/74898134645.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_29011bb391644ba58aa8e91c1f57647d.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_691a6aa8f1834263814d70529cd584c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/superekaxexeminulenevis.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/calligraphy_book_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/how_to_play_sheriff_of_nottingham.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9e560a5838c94faab1b515e61b96ae82.pdf?index=trueIn PDF document text
    • http://mujebik.atwebpages.com/25787518562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb8f03e-dbe6-4042-b048-ed40354e44b5/what_is_the_best_beginners_quilting_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366c43c3-7cbf-471b-a184-9a42fc783a09/2262475556.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/can_you_grill_on_a_weber_smokey_mountain.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_cd1c3685192b45999620ae68680fc247.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_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 5580 bytes
SHA-256: 056f8a325b735669c5f132f74ff053ccd527d8537f63d165c85d7f8735751bbe
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10732 bytes
SHA-256: 3f3f544ed307f0ec4c274acf59ab34fad91fafc50d4af275ec812216cdc519c8

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