Malicious PDF — malware analysis report

Static analysis result for SHA-256 79245fd016724048…

MALICIOUS

PDF

77.9 KB Created: 2021-03-30 20:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2addde557206d4c98ffae5fcb43a7e54 SHA-1: 2136b3d5a7ae362ed2893781f33ca81edccb18bd SHA-256: 79245fd0167240481081afe25d57ffe374d18390d1abdc5fa4105d8fa250dc6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution. The document body suggests a lure related to 'music sheet piano virtual', and it contains an external URI pointing to a suspicious domain, likely part of the attack chain. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it may leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=music+sheet+piano+virtual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5feb6f37ee9d1.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/par_quoi_peut_on_remplacer_la_feve_tonka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_601f87a9c154d.pdfIn PDF document text
    • http://jovedarike.iblogger.org/non_pathogenic_bacteria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_605643ec048f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5fe74a59d7097.pdfIn PDF document text
    • http://fuvepupur.22web.org/wutojotugigugejofoxaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugojejusovofeb.rf.gd/37361249988.pdfIn PDF document text
    • http://vozuxutebesur.rf.gd/67251070627.pdfIn PDF document text
    • http://kodeketabekem.epizy.com/python_for_data_science_cheat_sheet_seaborn.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/74192436562.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/enlaces_quimicos_unam.pdfIn PDF document text
    • http://jepogedepujadul.rf.gd/nulijulunexodumonabida.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_b449de5457924b9687d3e316d0cda288.pdf?index=trueIn PDF document text
    • http://xonowazibekaz.epizy.com/67060732066.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/error_e3_canon_mp250.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/hd_couple_wallpaper_for_mobile.pdfIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_4fef08d27e774dfba3f0a13791ca9fe7.pdf?index=trueIn PDF document text
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_f3d8da82a25548ba85f14772d64f0b53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/rexodoniwazapolasuka.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_86bd1fecc13d4cb39969cb890933c3cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xujitezu/66586787029.pdfIn PDF document text
    • http://zotawof.rf.gd/60607723089.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_4af7c28ecc914b38bbaa542f699d1a82.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_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5088 bytes
SHA-256: a89a8e67fee66f95d02c4ea38a228f38de65af06eecea4484ca06cc9879a6227
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10748 bytes
SHA-256: f08f9303308035e5477c6cacc459799db5fb6b6d1489edeed41473b6c27c9e9a

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