Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdba4912e90a9992…

MALICIOUS

PDF

89.4 KB Created: 2021-05-01 15:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b9a08695ff16169d8c9c96dcc596c42c SHA-1: 9975516807457992938ab8d8edf3e455a36c2fcb SHA-256: cdba4912e90a9992fb0af3973177c880936ffd4c5bcfbd967c55dfdbf7373b23
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous links, including a primary external URI pointing to 'baarspo.ru', suggesting it's designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of multiple disposable domains and link farms further supports the phishing and malicious redirection intent.

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://baarspo.ru/strik?utm_term=how+many+calories+in+a+mini+krispy+kreme+donut PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387233/normal_606729dabef97.pdfIn PDF document text
    • http://pijonon.22web.org/zebagox.pdfIn PDF document text
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/49ba46a3b6.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/MjjRRpJ/road_rage_font_similar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_600ca0da8dc5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6015912e4e7e5.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/jovepoxa_xugite_fuxiketodedorap.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/rawadi-nudegijakopaz-wosawezekul-demumivona.pdfIn PDF document text
    • http://juxoxelobonoje.22web.org/bebuvusipowamuguxisun.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/f36f043b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/83gjjhJ/cartoon_network_telugu_channel_number_in_tata_sky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jakujakula/players_handbook_2_dnd_4e.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/arjun_patiala_movie_pagalmovies.pdfIn PDF document text
    • http://juwebud.epizy.com/28995581304.pdfIn PDF document text
    • http://kaguwetu.epizy.com/girinasigupitusawaxawipa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 5436 bytes
SHA-256: e3ad52d9f8cfe69cb90823517ce70a46952639d075e800c0fb0487d1cd5fe709
font_01_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 12364 bytes
SHA-256: 7fcf11e1da7537389ebca4f0081ca37bf03319e4c1492fea9885679bfdb14889

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