Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bc83a3ce7b4dc4…

MALICIOUS

PDF

82.0 KB Created: 2021-03-05 22:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab344468c0246219809ad0f3f6d88db3 SHA-1: 821a4712661368d41df0b59b56230bbd0d041a0f SHA-256: d3bc83a3ce7b4dc4d7a5da88e25c3f7ea4556a237ea1c303877d58c40a2592c9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting a seemingly innocuous topic ('How to clean drain filter on lg top load washer') while embedding numerous links to external PDF files, likely to manipulate search engine rankings or redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/aws?utm_term=how+to+clean+drain+filter+on+lg+top+load+washer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421201/normal_602650ca100c6.pdfIn PDF document text
    • http://meetdouche.xyz/is_california_adventure_still_open1azia.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/96739426548.pdfIn PDF document text
    • http://d-youtube.com/2190732596z12g2.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/voxobumekud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_601c9617d20e9.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/string_to_int_ascii_c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_602b03704966d.pdfIn 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://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_21f3c518f81a4633bda824a3a40e86d9.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_1dd0fb30708b43feb624bf1082918782.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2d1952-ea81-4940-af53-48eccefa9208/how_to_change_font_color_paintshop_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2e5faf-1497-47a0-ac30-dabdbe5bc2f4/46370389084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6d5bdb-94e6-4527-8caf-5235663a9c75/61004317721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91c35a0-72b3-450e-a98f-952b499a4e64/libro_de_lecturas_1_grado_1993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2162f442-9da8-47e7-b8ea-e98657d75a1c/muwiwovivezazow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9862dd47-19d7-449d-bedd-9336de47a1f0/rogafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afecc58-3513-4964-ae4a-49a3b61b7f92/sex_offender_registry_va_search.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_61853a0699be4ae7a97b36c046bafb1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8961e74c-aa60-469a-b245-f2cdfc12904a/72013783140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec9883b-e7b2-405c-b3de-ae30dfbe84a0/67768456716.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_e343fc41bee24c2cb60d5c422c247018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 5256 bytes
SHA-256: e3d8cf129aa753bf36bcafef7e802ea6bc444cd4d44b9b78ef8e1466accab33f
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10696 bytes
SHA-256: 69e517163a04adbd73d1a0222cfc173b07fb067d3dc8b3f3922910d6d9ffb3e6
font_02_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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