Malicious PDF — malware analysis report

Static analysis result for SHA-256 084b29954d9afccd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 10:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6587d307cddd6a570878da07d3229e7d SHA-1: ddc231bafd91bde6f002128ed7c022f2c135e516 SHA-256: 084b29954d9afccd5ab970cd2c9a8267baea5603343afd9fb1c6b1a2c025f545
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm designed to distribute malicious content. The PDF contains numerous embedded URLs, many pointing to potentially compromised or malicious domains, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate an attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://lyzebrno.cz/userfiles/file/navobinosatufaxidowu.pdf In PDF document text
    • http://g-shocktou.com/user_file/file/19537335908.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/7189368950.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/7990641972.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nisibutojijivitiko.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/falazenirarevozuvijewobu.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/felipejemunutipotow.pdfIn PDF document text
    • http://honghuibio.com/d/files/3412123159.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/3578897600.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/21137260636.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/1699176010.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/zupevasarikuzozitumelomuw.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/xozurakupe.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/kajopiva.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/rewobapuga.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/24462214175.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/lipiriburusegatedaluxog.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/dixivi.pdfIn PDF document text
    • http://atrsara.ir/resource/files/momoniz.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/3048250456.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/6398144321.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/wepimibuzisekonasuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+java+for+android+apkPDF 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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 17280 bytes
SHA-256: 921caa6e5c8f81a537f3b981a68d456aec90a68a67d7cbfb2d378e868aa20932
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 10680 bytes
SHA-256: 093019b7b3b5d54b615e57151ad1fb6adc2a80e9475442fbf08ccdfdfccc88b9