Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc3ba0dffb08907…

MALICIOUS

PDF

76.3 KB Created: 2021-05-06 21:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b193b6622f272b69a3b5a04522d43cb SHA-1: c92e7af0050eee73c3ce69633aa049e893a6feb2 SHA-256: 6fc3ba0dffb08907192301ec5c422f426a170cc8886b67afc183a0f432c7301e
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 0.9998

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://resalured.ru/strik?utm_term=how+to+make+a+music+producer+business+plan PDF link annotation
    • http://esmoney.site/miparoxomodaxug6795q.pdfIn PDF document text
    • http://yandex-delivery.cc/13863514065p5ybw.pdfIn PDF document text
    • http://gayerkan.com/mens_size_guide_uk_to_us9yhev.pdfIn PDF document text
    • http://sluzhba1.net/farmville_2_app_cheatsidd0w.pdfIn PDF document text
    • http://cocobeautybar.ca/limizulidatexudakelewel8g4yk.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/nitajosasa/the_secret_life_of_the_american_teenager_full_episodes_season_2.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_406e859f746e40cc85366142d049244e.pdf?index=trueIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_28ee1df4939b4d03a358c3f632d105dc.pdf?index=trueIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_171ee4afffd44ade858f0624d7e6cb04.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_54bce98ed87a4628a4c732f405ecdb21.pdf?index=trueIn PDF document text
    • https://235be7ff-9b22-41de-91df-7a9e5ced5199.filesusr.com/ugd/4fa465_e4185da334f5479ebc20df1e5f2f9837.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_6d46ab6519684c43bc15ccac393a6f0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/sevemoku.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_ac6f8eae175c4fb584ce04f1fdaa92ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/universidad_tolima_sibate_carreras.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_6a047321b9794aceb8acddbd38e60f1e.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_06cc419b4f75470089ada5b38a78b666.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/gerizurun.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_bc6d3541fc3f453a9325a5d736ee50b7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 5476 bytes
SHA-256: 1e0072b51d7f8ee61aeddb56f0c2e6fe052562531b585ed5400d476757aebefe
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 10832 bytes
SHA-256: fc6d6a29d88a9bbb0bd1307218a51c4812fb1b0bc149bd6ca80d9502e287adc0

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