Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0371cc52ce32a1…

MALICIOUS

PDF

74.8 KB Created: 2021-03-13 13:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 23f4176b72529a6bb58221f6bedb4b20 SHA-1: 1af067992b8e5571322d574caec3bd2608579d3d SHA-256: 1a0371cc52ce32a182be37216f3d6eaaffc92c0e87a052a26484fdbcce27afd9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/award?keyword=catabolismo+del+nitrogeno+de+los+aminoacidos+pdf PDF link annotation
    • http://satotanubajedo.iblogger.org/what_determines_an_ecosystems_carrying_capacity.pdfIn PDF document text
    • http://gogodolajukapob.22web.org/vujedazugupafukadafojive.pdfIn PDF document text
    • http://allfreebets.ru/user_documentation_synonymuv7fo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5ff3eca39458f.pdfIn PDF document text
    • http://bitcoinov.site/939301304110tb3y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_6047b540c3562.pdfIn PDF document text
    • http://fesebenawasoz.iblogger.org/94573369326.pdfIn PDF document text
    • http://edaruzal.xyz/rukufadunorawfxscm.pdfIn PDF document text
    • http://bigtittybella.com/alexander_tamil_movie_free_downloaddwb3i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_5fdee4822eb27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5fd7c782e8d8b.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/bihar_ke_gana_video_songgwxhf.pdfIn PDF document text
    • http://profmaster74.ru/87501405597ndnkp.pdfIn PDF document text
    • http://circleshtang.xyz/project_portfolio_management_tools_excelfwvlo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_603a6d3073dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5fe43e0d9a6b7.pdfIn PDF document text
    • http://petajofap.22web.org/3800323955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_600c77e9954da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixokux.rf.gd/what_red_wine_is_good_with_lamb.pdfIn PDF document text
    • http://xadamodovupeniz.rf.gd/jomanilapazebikibep.pdfIn PDF document text
    • http://vejawojifig.epizy.com/afterglow_gamepad_xbox_360_driver_windows_7.pdfIn PDF document text
    • http://beruleruz.rf.gd/angry_birds_2_full_hack_apk.pdfIn PDF document text
    • http://ribaxekag.epizy.com/fokemunizerex.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 5520 bytes
SHA-256: dc28f55f6e7a9114371bc5ad44669c9a3aa72f0617c473f994e211e5e8494f78
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 11984 bytes
SHA-256: ed9e6e22dfae34c59bbdfff9b925ec05291334d6e3814b76a77cfd0ea0c0242b

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