Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6c92eac897b334…

MALICIOUS

PDF

105.8 KB Created: 2021-03-19 15:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2012cbaf984ceaf991910ef8e8f88ef9 SHA-1: 54b130fdac06ab7e530c5e195eb6d114c7457eba SHA-256: cd6c92eac897b3345b5f0add05b79dac74114c09e5ca4019175cd371ebb15542
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=what+are+the+limitations+of+cardinal+theory+pdf In PDF document text
    • https://cdn.sqhk.co/berovanova/CgXxNie/lefodurilobadux.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/craftsman_electric_leaf_blower_vacuum_manual.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/calendario_2020_mexico_oficial.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/forivit.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/DhergiQ/ramugenexawugan.pdfIn PDF document text
    • https://cdn.sqhk.co/dirajafowevo/0hgjjSx/vibapejejujipik.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/tidek.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/eTjbhcK/wujan.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/hhnbP1r/siwebos.pdfIn PDF document text
    • http://jabobafom.iblogger.org/what_does_ghetto_mean_in_italian.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/wjaEFha/54127853128.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/g9gejf5/fibigovigumupawili.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/what_is_finland_school_system_like.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/eiieYjc/mod_maps_among_us_for_minecraft_pe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://labinugekifuv.rf.gd/27369810554.pdfIn PDF document text
    • http://novorekafagodab.epizy.com/70321385610.pdfIn PDF document text
    • http://zininorenedalo.onlinewebshop.net/70668696710.pdfIn PDF document text
    • http://pozijirume.rf.gd/monster_rancher_2_expedition_guide.pdfIn PDF document text
    • http://wuzuzifo.epizy.com/stalker_bandit_radio_sheet_music.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/classic_books_to_read_to_7_year_olds.pdfIn PDF document text
    • http://suwutosu.epizy.com/hotstar_update_apk_file.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_off00014915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14915 5508 bytes
SHA-256: 37b20e367633532a34e335a96fd2e87ebbfd167e718777ecf483e7ec8ddcb1e1
font_01_sfnt_off00015bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBE 11552 bytes
SHA-256: 5852d907804304ee319a72e41b267e1bea7ff2ad27d5215fbc5ed90131648121
font_02_sfnt_off0001832b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1832B 16172 bytes
SHA-256: 22aa45a70cf70c30aa4cd4b82511f1abdd4af2386d2f61d608eea33f37561b56

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