Malicious PDF — malware analysis report

Static analysis result for SHA-256 e424c435a67ceb66…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 01:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2df9a590b2e51fa6238f6a982f1214d6 SHA-1: 663469b4c797722f0cdb6f86ad875fc0c18fad13 SHA-256: e424c435a67ceb66e029ebe208a0f0623db6f0449db617f20d75d880c9b0bb24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and embedded links suggest it is intended to redirect users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amzentransportationindustries.com/admin/imagetemp1/file/67085006889.pdf In PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/40189589573.pdfIn PDF document text
    • http://zuche0551.com/upload/file/29085884939.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/livoleximoved.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/lifikipidogugerete.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/98439149071.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/tuzavenuwuwowonurifiguxeb.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/62135750498.pdfIn PDF document text
    • http://tabletopad.com/images/file/79168096543.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379702a9ec6---18746382188.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vobiwujomarixemorede.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199034176156.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/22534986101.pdfIn PDF document text
    • http://showdoimovel.com/files/files/tadali.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/jofewi.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tolovatemajatanimotizego.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f14ae0a6---37759990372.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/7588308710.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/75041506678.pdfIn PDF document text
    • https://avflash.nl/upload/files/pinakaputukasek.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/vuxiga.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/41823725451.pdfIn PDF document text
    • https://artbynela.com/uploads/file/10166586709.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/tazef.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/sawemubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=boruto+episode+156+english+subPDF 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_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 11156 bytes
SHA-256: 998554c2434b73295a868edc66dee0b6d34c486d5d3ea387160d185f51c9ecbe
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 18480 bytes
SHA-256: 96e0b82a211650d2e9442c4e7de25a1f5024ee803b4c0265e0d1f3d8a9310255

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