Malicious PDF — malware analysis report

Static analysis result for SHA-256 569a519cfe25381b…

MALICIOUS

PDF

84.5 KB Created: 2021-04-01 06:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ed1507ea601dfd6f75f5a7a3d278ecb4 SHA-1: dcb32d42879486c09831a09073252e32b10162a0 SHA-256: 569a519cfe25381bef3ebff07d7d98277eefe2e6d796c702ce35a467841ee62f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are used to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=how+to+use+texas+instruments+ti-nspire+cx+cas PDF link annotation
    • http://manovina.mypressonline.com/palisesuxelal.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/QiiWghc/hair_colour_theory_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_604990256976e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_605f5efcb8a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_6028a64a39509.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/eggBRge/retajiganigap.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/xasovewipeje/zoboxubamozegalujijizovuk.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_eda1bd6db55144bea1b0f61152c81454.pdf?index=trueIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_de95b7339c65417f98224ed3badb1ada.pdf?index=trueIn PDF document text
    • http://vidilig.onlinewebshop.net/bouldering_for_beginners.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_1e0d8340935c4a6880b8d4b83b9b578f.pdf?index=trueIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_aa44de887d8943beaa424da44310a40a.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_5e69864579f94d40adc2b5cc4c83bd9c.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_daad9f79fa8449498ba19b60779b0137.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xetasif/alcatel_3026x_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/cuales_son_los_atributos_morales_de_dios_segn_la_biblia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 4084 bytes
SHA-256: c77f8944e97e41e94f9eddf516ea64b38a0494e8dce209c20ce3c6e4d040eb17
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 5200 bytes
SHA-256: 0036b5e907ad4e42c3a2650383b16c090f87d9f9974d798ae2e514ce9655efb8
font_02_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 11420 bytes
SHA-256: 2c6fde38debabb8e8335f2cb680e102ee968e02d877ebdfdb7811c37570f2cdf

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