Malicious PDF — malware analysis report

Static analysis result for SHA-256 976bdb95e1fa29f4…

MALICIOUS

PDF

103.4 KB Created: 2021-04-25 16:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1ccc7a1145035676eaa5d19d0f4adc8e SHA-1: b0ce4d612e47f470ced8c159d0d448687f41fe9c SHA-256: 976bdb95e1fa29f49a112491e2d625ae4f8b33a8592cf3193c3ff4cfd6942e52
186 Risk Score

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 0.9987

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+big+should+a+ball+python+enclosure+be PDF link annotation
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/xojuretovib.pdfIn PDF document text
    • https://kamurodogoruvax.weebly.com/uploads/1/3/4/8/134887894/jegawa_rotibosa.pdfIn PDF document text
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/zipized_vuboxupesiku_saliwawulirin.pdfIn PDF document text
    • https://moxizeza.weebly.com/uploads/1/3/3/9/133999163/xubarebijawexedufike.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/f498b4b6-65b7-45ad-ae75-c9fa33ff2a81/agno3__nh3__h2o.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b5be99-8cfd-475c-aad9-10db3bdeb0f0/how_to_clean_a_2.0_keurig.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/modele_attestation_de_formation_continue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08df36ae-ca5c-4229-8a6a-50932601955c/humanism_learning_theory_examples_in_the_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817abcf6-9a2b-4a88-b717-99ee70a58c7c/what_is_the_appropriate_definition_of_information_technology.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_4d52b6b7e67f4c6bba0ba62186c67d4a.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_1402de9a76b7489fae2b3ed0711421bb.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_bee985313b174bd8b489af9d10a64150.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jonora/2016390109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b865fed4-b0ab-4e13-8cf5-f0d6cdde2070/33785796307.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/handing_and_taking_over_report_in_nursing.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_2bbecc541d6348d587c216baeebc6ad7.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_bc6da59be2f14d76b532c01e99e9cc3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/avast_cleanup_premium_2018.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_a43d36e8a3f549b2939cb95020f09d74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/582e82e3-5f04-46aa-855e-a3ecc41ab701/the_lion_the_witch_and_the_wardrobe_book_chapter_10.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_fedf73c763004994b6acbed818dfc0a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/097b27e8-9c43-462d-9941-d20f12e3a3cf/sat_medical_test_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bd661d-6254-47ce-a241-a57485678e3b/52864800819.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/android_lesezeichen_importieren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d7c9f0-4e4d-4940-8ac8-c2da81409c1f/why_is_tiresias_important_in_antigone.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_off00013dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD1 5632 bytes
SHA-256: 233754522e23b448d69c5be3639eb7d6713c361a1e7f24f02015db5e64f8bd5e
font_01_sfnt_off00015104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15104 11708 bytes
SHA-256: dbf45bea1cdbde08ac6b79107a3e645c72b75e34cdc135c8147f2da57aea4f94
font_02_sfnt_off000178fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178FA 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f