Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f9bf3bd2c40a0d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 07:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6e527e98377dca6f05823044cd547c1 SHA-1: 77ff65c2150d529034e3c8e38836d3ac8a3a97dc SHA-256: f9f9bf3bd2c40a0dda849265ebaefca409b01e6b5cd9500ebaad4ecca2a5574a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the 'link farm' heuristic point towards an attack pattern focused on redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=how+to+send+location+from+android PDF link annotation
    • http://whuntex.ru/userfiles/file/nodexozijalijugobulu.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/xoliwasawozifefizesu.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/gipekeluwepaderarek.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902125054556342.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/17359406816.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210901105902352.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/gezeje.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8fe15c87cee6e2ed19517e04ad80276d/roganowomokevaluriw.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/junogotafibosuwanomedo.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/dejovokavax.pdfIn PDF document text
    • https://trainova.com/userfiles/file/81107345851.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/mosexupoga.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf613864d---zoxab.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/baresel.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/18586464555.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/15723530154.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/5493892937.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109050756293710.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/niruwinavupegasemitatemo.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/fagovewerijevake.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/miloperixiduvojot.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/xetilifefejuponebu.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/52753466521.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910150603.pdfIn PDF document text
    • https://airbays.com/userfiles/file/95646236534.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 10712 bytes
SHA-256: 59fe0c9d75c76f8eafb68701569f22c353734526adf0e6b0324c07adfe7f6ad8
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 17848 bytes
SHA-256: dc65a91a05c2c414bf3d7545d539961b07dc1a0bd6f672353453d313cf888ce7

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