Malicious PDF — malware analysis report

Static analysis result for SHA-256 a581c97d921f9333…

MALICIOUS

PDF

91.3 KB Created: 2021-03-06 04:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28a34309904181fa2afabc1a497dc4aa SHA-1: 210733e65b5b9b2b380d9d602013bd37bcad1d33 SHA-256: a581c97d921f93337f53f15a20d1365cf0184c6f7acf107c4d0eb5570e320dc7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosting services, indicative of a link farm or SEO spam campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/award?keyword=minn+kota+talon+12+problems PDF link annotation
    • https://cdn.sqhk.co/dugelabomaw/iaxjcgf/livowupob.pdfIn PDF document text
    • http://nokigafapo.22web.org/mojud.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/igOjchb/69097169243.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/giHygdN/change_message_sound_android.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/batekewala.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/cgfadgh/28739748819.pdfIn PDF document text
    • http://taxiralimivi.iblogger.org/confederacy_of_dunces_plot_synopsis.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/cI7Hic5/7_years_old_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/2nji2jf/21085385627.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/vafarulasumoso.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/fgwUr00/fix_windows_defender_win_10.pdfIn PDF document text
    • http://niwujobexev.22web.org/wazixurirajelu.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/o7regeM/juvupitidum.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/19126500693.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/die2Sjh/xomoluwusekiduwudilub.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/hbhcQKf/jio_meet_app_download_for_pc.pdfIn PDF document text
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/5307704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugunimekuxaf.epizy.com/minonubojetalobo.pdfIn PDF document text
    • http://pimizebogo.rf.gd/react_stylesheet._create_is_not_a_function.pdfIn PDF document text
    • http://bojivudotafaf.epizy.com/corrugated_plastic_roofing_sheets_nottingham.pdfIn PDF document text
    • http://zevazunepig.rf.gd/openssl_crt_to_pem_format.pdfIn PDF document text
    • http://rilobun.rf.gd/business_code_of_conduct_template_uk.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_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 5360 bytes
SHA-256: d372519dfda2e90e28b2241d7eef512afca26400769b56a951826c4b373ec771
font_01_sfnt_off00013ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA9 10760 bytes
SHA-256: eefd32e4dcb70509b777b1eae0151b3583511dd05c5b0fb066f6a3ef37c0d0f3

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