Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f83b35e0e374834…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 20:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05022f1d3f26049bf3f9d0e7e32fe1a8 SHA-1: 61d2e17e19f5d803957b320a601849c91f7dd40a SHA-256: 7f83b35e0e3748349544d3ebfef1ecbe69382f252808d793e5c53b24ebe695a1
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The document contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mtydizayn.com/userfiles/file/tunamabaripabesuvewupow.pdf In PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090801142073499.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/pateposuwudazow.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/85482866456.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/jibinedizejogoxolav.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/8203173074.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b368567a37bf2dce17ecb72b248bb3e4/kogaxumez.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/23846820309.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wefuxexa.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-8/20210908053605265218.pdfIn PDF document text
    • http://talleresjpg.es/img/file/29151539299.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/85640567723.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/31901612312.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/55536652042.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/700143974612f3c5e38dac.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/kogabolimekiwamanutapi.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/roxulepuvixu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/toratow.pdfIn PDF document text
    • http://tabletopad.com/images/file/75828168393.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/suduxojajemumiv.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/jesadamiludadosupu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdad2ca562---xefixikepaxojosusixegexuj.pdfIn PDF document text
    • https://siroyensao.com/upload/files/xiwazawiwirosetuwikesobaf.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/99766740448.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tonixixumigowowetiraxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+see+hidden+wifi+name+in+androidPDF link annotation
    • 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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 17228 bytes
SHA-256: 005137d5406ece698828b5bbce33a438224f492eeac4f304ffaf47f9b71529ac
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 10652 bytes
SHA-256: 2c86f05ad58091f87aad0263a553b4a3125802e9e76d406cbc3ae14335447958
font_02_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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