Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b2486634a465e…

MALICIOUS

PDF

92.7 KB Created: 2021-03-18 03:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7cd4c40ff141dd52dc7ad4aef91a60 SHA-1: 53a23490499602349a46c8406db3b9d0fce159cb SHA-256: 8c4b2486634a465e3e230faf97f4185032dff15e1cc25dbb4c8f3ce0f58a068c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, indicating a potential link farm or phishing lure. One of these links, https://resalured.ru/123?utm_term=d%2526+d+character+sheet+level+up, is flagged as unknown reputation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=d%2526+d+character+sheet+level+up
    • http://bevatijiwavefad.22web.org/goludexetogunu.pdf
    • http://julapekawej.22web.org/kapeludaliponuxur.pdf
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/fokabanok.pdf
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/jedifekifut_matefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_12a3d5aedd824709b9fd6ec0254b14de.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_ba0a380618cc44b09f791159e8ce33e4.pdf?index=true
    • https://s3.amazonaws.com/wixanarer/jozasinemakigep.pdf
    • https://s3.amazonaws.com/gazijewevan/kemper_profiler_head_case.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_184869bf709c433ab6a59c0509387475.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_dea1cd05dd9743908c6d32df44903eff.pdf?index=true
    • https://s3.amazonaws.com/levovod/baixar_viewer_apk.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_4687ecfb933747c09893d1921b4f5d95.pdf?index=true
    • http://nusilemil.epizy.com/91407884758.pdf
    • https://s3.amazonaws.com/lonozote/mogaruzawaz.pdf
    • http://birabigipo.epizy.com/software_development_platform_definition.pdf
    • https://uploads.strikinglycdn.com/files/c7d5c0c3-b80c-49ac-b710-8b1fb9ef7707/how_do_you_multiply_out_the_brackets.pdf
    • https://uploads.strikinglycdn.com/files/cc53d774-9c42-4abc-a157-6379d2d434d8/2717794985.pdf
    • https://uploads.strikinglycdn.com/files/1ff329f1-c455-4680-9859-e3b99afff214/32172708984.pdf
    • https://uploads.strikinglycdn.com/files/538a14de-8321-4664-a114-a8050c7a1bc0/92402879102.pdf
    • http://mofagadelebedos.rf.gd/bodyguard_season_1_free.pdf
    • https://s3.amazonaws.com/gisujubolidine/getedabonidukigusojosuz.pdf
    • https://s3.amazonaws.com/zubata/55510677781.pdf
    • https://s3.amazonaws.com/joterige/new_testament_reading_plan.pdf
    • https://s3.amazonaws.com/pafexegud/gejipezubidowudibekejek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fe6.bin
865832ca46ee1aac596e2af09c34c3d6059d9ba0f9f4eea226865a594599e1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 3484 bytes
font_01_sfnt_off00011b53.bin
685131e098666c6ae1ca9a19025b305906c0b0ca214a8d3d6e83d52ddd5fef53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 11300 bytes
font_02_sfnt_off00014221.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 16164 bytes
font_03_sfnt_off0001573a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1573A 4324 bytes

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