Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa05c1acd487858f…

MALICIOUS

PDF

111.3 KB Created: 2021-09-19 12:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 994df4a0beffe9b96450f87ddb716f39 SHA-1: 5dca1be5102be5b7e98618d93fea06e23c4d0da7 SHA-256: aa05c1acd487858f6b6d9ffaa120e8aa9dc37f6010be6b8e0e9843b09e1e3677
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://naturallabs.fr/userfiles/file/tobed.pdf In PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/92067987880.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/42460291531.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zurulezinipevol.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/66304441962.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/71876286130.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/kewetad.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/velebugozakoxupus.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gokosaramejo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kd827u9beoh0m8eabnbsotg9dl/39573323540.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/85013222752.pdfIn PDF document text
    • https://makenie.com/upload/files/25818720379.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/zoxavu.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/pabakagukemivoxaxi.pdfIn PDF document text
    • http://houselandia.ru/files/geluzugokakekukod.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/buniwazavozezewufu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/38973437206.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/74758287164.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/pegidoregukizavopub.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/99887481406.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/bezutewawukid.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/15820929420.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/21023131804.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/31230881966.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/78544750865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=human+villagers+modPDF 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_off000146a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB2 21836 bytes
SHA-256: e4aed3255704e8f16b2708fff70e302d46825bab70b31591e75c8758adae9d04
font_02_sfnt_off00019726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19726 10652 bytes
SHA-256: cfe7cb5556ecb2525d2f88da27042e46f995bf13e6afb23c3054a602f1d88054

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