Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7e358fd744d959…

MALICIOUS

PDF

104.1 KB Created: 2021-10-09 09:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0e4c7051ddca9f29f2a08687ed69fe00 SHA-1: 10b8860761db1a1d2c4577e9d1896757f67a688c SHA-256: ad7e358fd744d9593ebefb6904c8a9d2fcd460d7c73ccbf61f78753db6e51fb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. It contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=section+13.2+forces+and+pressure+in+fluids PDF link annotation
    • https://silky.ae/images/bulk_images/files/44187657193.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/82289034406.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/goziparagivaralijivilu.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/52083753805.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e0ihsuftoli9f4e2h2lf9l8rhp/zaloposugo.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/texos.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/dozozepepivijaxibodiwexi.pdfIn PDF document text
    • http://northcity.rs/slike/files/kivogirogi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/ginexidozagugodunagat.pdfIn PDF document text
    • https://sergiomauri.com/images/file/79419665762.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134964bad55b---36262818842.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/80972796870.pdfIn PDF document text
    • https://langumeistras.lt/i/File/49639063822.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/86750053530.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/daveludenuxixupali.pdfIn PDF document text
    • http://webursitet.org/Files/file/pesuxalavuvijupo.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/50002315473.pdfIn PDF document text
    • http://reopen911.info/media/file/rumekawiniruzaxavogipupod.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/54076331958.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/80209113367.pdfIn PDF document text
    • https://pt-lb1.pasarantogel.com/contents/files/44492568846.pdfIn PDF document text
    • http://jjteriyaki.iorderfoods.com/uploads/files/nawesokulabixaxijag.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_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 21216 bytes
SHA-256: d0eaacb2a2f0fa92cadbd613b5f0801bea22bb7938388599c7bdf9c8496c134b
font_02_sfnt_off00017824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17824 11196 bytes
SHA-256: b6ddbf708c5d51655eceb882676e55c284098f1e6420ee00774b95e98639b274

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