Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed47e77834d7ea1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 11:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ec1295aeea508185f61280cb22d76f5 SHA-1: 360e8327233e76a347b3e72fe9f04ffd3865dc6b SHA-256: fed47e77834d7ea1cf732bbabf1430b43a2b1cf3d17d8db58fef5b615013fc88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be link farms or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a link farm strategy. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irths.com/upload_files/files/sevol.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98699475069.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/78446762278.pdfIn PDF document text
    • https://datajournonepal.org/files/xujelu.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/34111030641.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/bovenuvexim.pdfIn PDF document text
    • http://flexa.cz/docs/file/6154804621.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gireximavunud.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/31603145907.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/vogis.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/9136606298.pdfIn PDF document text
    • https://temahr.hr/files/sidakoxu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/18912165500.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/laxilajasebadaxemu.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/60597945199.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/50317384250.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/vusedovebabedepit.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/denitagabuvibuk.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/karivujaja.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/74955807940.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/zasewikatew.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/miwobemuri.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135151f7e91d---sovadigivaretuwuxupuxupij.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/zufowadajowijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=iphone+free+song+download+appPDF 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_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 10624 bytes
SHA-256: 764744e24914f5cc467d4f84efc35af5f7069c5a438dc062cde647bf67d6f703
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 17980 bytes
SHA-256: a359f5ad5b5693d410e4c40ed96026b9902dc64f60a285a41df9d8ef2a30d9e8
font_02_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1