Malicious PDF — malware analysis report

Static analysis result for SHA-256 3380dd32b0da76f9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 21:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e06cb7bd5a7abb10ad3550a5411066f SHA-1: 416da67776f842f46e559e2813f057c6e59bc180 SHA-256: 3380dd32b0da76f98f2daebbb0bcda8f00eb10d998ae41d1d7862c6937ef4488
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, and heuristic analysis indicates it functions as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=twitter+install+android PDF link annotation
    • https://10s317.com/uploads/files/202109150550493150.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/51405205918.pdfIn PDF document text
    • https://kaparatt.com/images/File/tikijowenutemezosimopaf.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/zojumipogeliveveneru.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/3481933348.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/89669233316.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/zetiluwujasuw.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613577dd88960---57212387119.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/14158549753.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/wapog.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/85916129080.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/5893439049.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/9676325526.pdfIn PDF document text
    • http://fedime.org/imagenes/2055957769.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/43374877701.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/soxoxavovenixezabesozuwi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161318ffbb4865---telokuvovegefidudeze.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/6110860417.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/8297535105.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/96306744684.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_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 18864 bytes
SHA-256: 6e7e519ad8d72521640de3f0f871d0f1e30988b508cb9cdae51027fd58eaa063
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 10292 bytes
SHA-256: 579057c1d8593c1e245c7c8415ab596a39db0dcff0dc59f9f3fea07db245642d

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