Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b42a83ea86e6f56…

MALICIOUS

PDF

86.3 KB Created: 2021-03-07 20:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ac430c4a43c5cb1704a88f55e5fc1723 SHA-1: 589b3d34aef6ffd8e85cbdc7e7eacd6b7e11d21d SHA-256: 6b42a83ea86e6f560e538614703c76726ea58183d33c8c39c9abf8252b65ac9a
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=columbo+a+friend+in+deed+goofs PDF link annotation
    • http://morasuxod.getenjoyment.net/how_to_determine_body_fat_composition.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/planeacion_estrategica_de_una_empresa.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/74513597459.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/vebifuzibekebodisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_588d8015c75743b99e0db0bb591ee3be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizup/empty_circle_of_fifths_worksheet.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_65c944dc20054b139ec9d6ebfca150c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapijifas/zyxel_pk5000z_modem_specs.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_8c0c023e0b1e474caec643e0b599eedd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/zasijaxap.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/ankleshwar_to_pune_train_information.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_bb93179d5d504070a9c406ad3f34f8ba.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_804be05f5d2f48fca23cb3bbbc3c4561.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_9fc6e29b3dd848bc95b1fd2c337f698b.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_669ccc42a8d344228c545c7f3a62029a.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_a264c78cb38442968f33c623d8e4d955.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_8d9d9fac7e3147dd92275d1a39b74d6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/3534496213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a58475c-edfa-44a6-88b3-3b131bb966b1/fosiwisudewe.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_31eb3ba0ac874a579799532f400dcdc1.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_76898059584d42bfbfaf01a1c12ba317.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/551bd9e5-e14c-47bb-a9b4-9dc87fc8acfd/kusuvolurelikenaxudipog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a4831e-9310-40dd-b155-b7e11122f5a9/safoluw.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_be6e4b4fabcd4a55b3314fbe0a71f0d3.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_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 5272 bytes
SHA-256: 19d76c53510987db2968fd8bbbbbb8c666f63c32374a36d52c38f887f1522ef9
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 10908 bytes
SHA-256: db97e41c546edfcd069bb0683c39379a05f4f487c6ae02bef84aee293f90290b