Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90fe6ef49a1adcc…

MALICIOUS

PDF

75.5 KB Created: 2021-05-15 02:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bdf5fee7415537e44ca609c4532b3d0a SHA-1: b1dca1e748fe15986dfe32cc4a321fdd69c8ea44 SHA-256: d90fe6ef49a1adcc9e533995df0b1ace4169eeb4b2e17c069c9879f41f9ba98a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=girl+scout+brownie+story+short+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457876/normal_5fdc78cd2663e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_600bf35da0c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_602509567af27.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/bugeda.pdfIn PDF document text
    • http://maliwalilaz.22web.org/34751970205.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/4677756.pdfIn PDF document text
    • http://faguduni.22web.org/alphabet_matching_worksheets_printable.pdfIn PDF document text
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/6941304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/putelekireza/70679157414.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_1f9df8377e10439e8ea62fb6e38c0245.pdf?index=trueIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_2fade827c8ad4c97af468a95edbb0f60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/dsp_incident_reporting_guidance.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/radio_thermostat_ct30_low_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/59302756570.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_e5c96018e7464318a8b7cb70ecf2196f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/fonabitolonir.pdfIn PDF document text
    • http://voduvurikijo.rf.gd/what_does_the_word_logic_mean_in_science.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/is_cyberpunk_good_on_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/lipid_2018_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/animated_movies_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/do_re_mi_sheet_music_with_letters.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 5100 bytes
SHA-256: 53951c667770dc929665e0338d8e4435de50531986b32b8c38cc182bb38d5787
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10420 bytes
SHA-256: 016e3fc6a8bcda67fc983da1cb5fc4288d27edab4c0112d39ea3a1596e5785ba

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