Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a39903d76f45e4c…

MALICIOUS

PDF

201.0 KB Created: 2021-04-08 03:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f7fe475eaed8ce7f6a1aa46169e25a02 SHA-1: 05eabad7f6359ca93e6570326153fea1e16e76b3 SHA-256: 8a39903d76f45e4c31cb3a768353460e8be2c4cb8d17d972e1f3f92165395c2f
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Acertil bula pdf', directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/123?utm_term=acertil+bula+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe1cea143b37.pdfIn PDF document text
    • http://imedo.ru/cannery_row_chapter_25_summarydu4x4.pdfIn PDF document text
    • http://plusstore.pro/love_messages_for_husband_romantic_images10bbq.pdfIn PDF document text
    • http://artyom.guru/kujonifefajufo4tn83.pdfIn PDF document text
    • http://autobaff.xyz/zetawufunevubwiiy4.pdfIn PDF document text
    • http://lotto-investclub.com/the_book_thief_summary_chapter_5rtcl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_606acf5be7bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_601a7b328c8f9.pdfIn PDF document text
    • http://good-production11.site/309114041976bh6n.pdfIn PDF document text
    • http://worldhold.online/fishing_knots_guidecdx26.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://uploads.strikinglycdn.com/files/1fe20cf1-6dc2-4b8b-bcdf-5599c952e025/how_to_do_tapping_to_lose_weight_in_a_month.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/avast_antivirus_software_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec52bda4-7d7f-4994-992f-c9adea2e5bd7/polk_audio_subwoofer_psw125_cherry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8da9ac-9975-4d0c-9aac-5f8ff526ee02/bavosolamagad.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/vuxofakoxoletififatuxazat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965a8beb-dd1b-4201-9ee7-4ba1e570facd/zikonezikesutake.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/what_major_events_occurred_in_the_1900s.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/vovinanofaxujosafizof.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/how_many_types_of_sap_courses_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc67e601-9d3b-44e5-9fae-53c059dcdbce/96226100846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ef0650-5b8e-49dc-bae5-653df89a999e/wa_gas_price_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738dd4f6-219a-44d3-86bf-3fcdeba5c67a/a_feeling_for_the_organism_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f3a7ad-cf72-46c7-9dea-7b6a78bb964d/baltimore_catechism_1_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9387ee3-e84d-4773-833a-ae43c112a89c/why_is_my_camper_heater_not_working.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C107 1560 bytes
SHA-256: 3ad774f45d0634a7484ccf6d251cc02c168bb57017bb54dca8977b2f3dc7755e
font_01_sfnt_off0002c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C905 4764 bytes
SHA-256: 2242583e6eb85a06150411f5460f44605fa1a6625b64d9dd4d3ab35e3b9834eb
font_02_sfnt_off0002d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D93C 15108 bytes
SHA-256: 0292174bae9f7295e59e6cc6c1e77b97bd7e83f8ba8bf0d8a3db3679f58cfb49
font_03_sfnt_off000305c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305C4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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