Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b6777ff5bb4c52…

MALICIOUS

PDF

73.4 KB Created: 2021-10-07 12:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f1561cb4f6080a0345031021c5102f6 SHA-1: bde487ccda9692cf990b8cf710d5976c47591462 SHA-256: 30b6777ff5bb4c52de533c6bfb3cec6c693b4d379073a5f0912dd4838e7dea5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and exhibits characteristics of a link farm, with numerous external URIs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5058

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://pfmconsulting.org/survey/userfiles/files/xoguluraregegekerajunabo.pdf In PDF document text
    • http://assytekservizi.com/userfiles/files/tetofofawofepurimerari.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907151732.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/vojufopuxafumipifap.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/fosiwibonujufinubom.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///70028811147.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/dokuzufina.pdfIn PDF document text
    • http://fedime.org/imagenes/69513612002.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/medelafuzusenid.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/ruvovevuzowuxotozefot.pdfIn PDF document text
    • http://sakem.org/userfiles/files/72482843918.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/78679153303.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/webupusuzuniwaket.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/37890815323.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/netave.pdfIn PDF document text
    • https://griffithnorthsideapartments.com/ckfinder/userfiles/files/zifuwujaporizevuxodiwer.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/62048400931.pdfIn PDF document text
    • http://twilaw.com/files/files/fasawokomegegenaxokuxon.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/14367905062.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/manog.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20211006054713.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jjnk89l14n8m2l8e5ea6p4u1ug/50574159568.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/sasafixujixebawuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=band+stop+filter+op+ampPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/86139276866.pdfIn 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_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 10712 bytes
SHA-256: a83792681ef8f37da1e17393bab40477871d6c1df96589adf90d07e2bba861e0
font_02_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 17340 bytes
SHA-256: fe39cf354c37cb7d3e5f2ecdf093809539527b20a4297d41df58d2b3f40509b1

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