Malicious PDF — malware analysis report

Static analysis result for SHA-256 e503817da620a28f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 00:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3fee31f7261de1719baf3bb1e9de8be SHA-1: 8b71fe64e183aa43f05d358bfe2629960816b837 SHA-256: e503817da620a28fd7a7586f98319a34cc4f83d4a1365eb98ec9354ae4acc376
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The PDF structure and embedded content suggest an attempt to disguise malicious links within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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://garglob.ru/uplcv?utm_term=making+a+flipbook+online PDF link annotation
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/fipesogalavamo.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/pejevevubofezizukatefi.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/zadazegegipibuwesisunolu.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210918045948_9jk9gs.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/66670082425.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210912204505.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959e448066---bazazivaka.pdfIn PDF document text
    • http://profstil.az/userfiles/file/kalikunegakubez.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/80402403053.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/70359443728.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d346547ad87e091dbc350e321a57f8b6/dixururigepilibedon.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/89049970821.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vamipetafumivivili.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95378421589.pdfIn PDF document text
    • http://clingac.com/d/files/pevowagizifodabases.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3611784920.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/dalolim.pdfIn PDF document text
    • http://poiskvod.ru/images/file/27320921279.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/moxanegeragumivizetata.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/fojilulotesijal.pdfIn PDF document text
    • https://clickbox.ro/images/file/43705080959.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tukedokujinategav.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC5 16804 bytes
SHA-256: f7027f759f4721ac5e74b385fbd9cb188a9fd0b4f4538607045125dcce95b273
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 10392 bytes
SHA-256: 16bb677e87abb2b40addd96f47ba36d5b626bec33f927ce5373c1c33508ddf41

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