Malicious PDF — malware analysis report

Static analysis result for SHA-256 a571a6de7cbd3955…

MALICIOUS

PDF

70.5 KB Created: 2021-03-29 22:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ce4280098674731d5885902db4cb5c78 SHA-1: 2df1d0a7129c020cccf1767c427a0ec50e4f13bd SHA-256: a571a6de7cbd3955c89f35d07e5c2cbdfb692cc4f8c96694b378d38b6c65cd5a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://mezovuduw.ru/strik?utm_term=what+are+the+parts+of+a+bathroom+sink PDF link annotation
    • http://wamagobegufif.iblogger.org/learning_spanish_basics.pdfIn PDF document text
    • https://mopepeserowote.weebly.com/uploads/1/3/4/6/134621402/zitisoxu.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/romesasonatidu_setakodobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_604d3d319c93e.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/17031034433.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/79012905407.pdfIn PDF document text
    • https://sogenaluvejor.weebly.com/uploads/1/3/4/3/134328850/bikujiligel-veroluf.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/black_and_decker_handy_steamer.pdfIn PDF document text
    • http://fujozed.22web.org/6790232196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_6009bee45248f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_6022eb0629dd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidalanono.myartsonline.com/apsc_syllabus_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b22ee5-1110-4e94-9953-f1f404a2e50a/how_to_mig_weld_correctly.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_5d53aead388a4e89901e15ce5b70b9de.pdf?index=trueIn PDF document text
    • http://koradanizepagow.myartsonline.com/46509384529.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_fe7c789609074ca09d8a8da7aac9e350.pdf?index=trueIn PDF document text
    • http://nekopujopulo.rf.gd/captain_underpants_movie_free_download.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_1ed87315463d420c8ebcedad6ff0ea13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/135b6c8a-4a26-4ad8-9b3c-2e39e43fab70/25403549141.pdfIn PDF document text
    • http://xalogazu.epizy.com/health_o_meter_digital_glass_scale_accuracy.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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 5324 bytes
SHA-256: bcbca57037cfcb00b555ff7bd940d9d3d957536dba5a1f8445d8e20f9032cd8b
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 9936 bytes
SHA-256: 8cd8531342419d5d6189732d77e5f70c8f3648dda99f5f3d273ac0c2a1498b93

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