Malicious PDF — malware analysis report

Static analysis result for SHA-256 4942d9809840caf8…

MALICIOUS

PDF

78.8 KB Created: 2021-01-23 00:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 51891e4ac063e6987114329832a93c27 SHA-1: 725f1bc0e3ba7b4ee3f1d6a8d3379117d3be85fe SHA-256: 4942d9809840caf8dc5289a1408df1f9359f0d3b54a8e396ef8779c12312131b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the ML classification strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=descargar+huawei+bootloader+unlocker+apk PDF link annotation
    • https://cdn.sqhk.co/jaselavujuwi/OhcP5xg/misugodub.pdfIn PDF document text
    • https://site-1173433.mozfiles.com/files/1173433/hustle_castle_gem_guide.pdfIn PDF document text
    • https://site-1245817.mozfiles.com/files/1245817/visual_studio_2017_git_commit_message_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_60097dca0ab14.pdfIn PDF document text
    • https://site-1178448.mozfiles.com/files/1178448/8882152746.pdfIn PDF document text
    • https://site-1172346.mozfiles.com/files/1172346/xotowesapobegitilukerifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5feddf7577b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_5fd8d7a833c0d.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/cjjijiT/kapodujofotaxikowu.pdfIn PDF document text
    • https://site-1180242.mozfiles.com/files/1180242/transfer_paper_for_cricut_glitter_vinyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_5fe8b30e059da.pdfIn PDF document text
    • https://site-1177351.mozfiles.com/files/1177351/pokemon_go_community_day_september_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/idggOJv/15830757837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fububosuvakosal.epizy.com/25686091443.pdfIn PDF document text
    • http://mafevela.rf.gd/sap_bpc_epm_user_guide.pdfIn PDF document text
    • http://xijovapafibowuw.rf.gd/cwm_recovery_pro_apk.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://scripts.sil.org/OFLIn 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 5632 bytes
SHA-256: 9e1ec7687d16ea0e70b92df6f5aed11ea5f9141c24e74e030ab732f94d596aa4
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 11384 bytes
SHA-256: 90700e60124405056d330e8b91e55adeaa16bdc951f96c9200f08cb2c8a5c666
font_02_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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