Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c229196311d5be…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 05:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 063ab92d6938631fa39fcd3497b3302d SHA-1: 090b9940e92c36484a078492028b4b420f1be8e7 SHA-256: e0c229196311d5be76a16ff4a561f11bcc57574f7c8203269c8fdf67bf9ede91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, suggesting a phishing or link-farming campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=pathology+book+for+bsc+nursing+pdf PDF link annotation
    • https://egyiksem.hu/uploads/file/56651389884.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/jonazetisetusatifos.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/15749928152.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/woponerifomabob.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/wamovedamuvuwexolirufupe.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/20422275184.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/86137645603.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///6139254571.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/ranopama.pdfIn PDF document text
    • https://doitoutdoorz.com/file/n7SAnuSPXM9b8OrI.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/likedopi.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/bazuxe.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/np6bmdch5tk29he56g9gdsmos0/woxasimifexorovujov.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3242d5f68d8524131b5f9049ab749d3d/zesidotisoz.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/32754228413.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/fiwuzotudim.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/25461155868.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/28107502416.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/34459647444.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/dutifiwujixoxakenoso.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/zudusivadobebikes.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/77115869818.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_off0000c1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 17696 bytes
SHA-256: a0dd8978e90466f6e603c897acf53ccd09b4b1196dc26d8fbd1486c306da24a3
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 11212 bytes
SHA-256: 67a4b0c469185817d26449cbf389682722b179402b9624417be6f8eafad7debb

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