Malicious PDF — malware analysis report

Static analysis result for SHA-256 73705f4fc085fec7…

MALICIOUS

PDF

79.9 KB Created: 2021-02-12 18:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9689c760bdff681fade86cfb3c6fd94a SHA-1: d71609e5b148cfaf83ba88092b0b13fde1b03862 SHA-256: 73705f4fc085fec7f3f0743af75010beadf41762c3e94a71acf2aeb2eba96184
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 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=manifest+now+idil+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fd9d4f773ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_600d44f12bc8c.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/rulibalexexitav.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/ieDGia9/77128328939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529087/normal_5ffa9974adbaa.pdfIn PDF document text
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/fakupolududelaki.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/jfjclio/gavogejemezesakir.pdfIn PDF document text
    • https://cdn.sqhk.co/lukupupiba/hddhggc/bogolegikawedilodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_601e8f3ba3fe3.pdfIn PDF document text
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/visofinetowagi.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/povulipasukop5wrzy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_60104c4219dd2.pdfIn PDF document text
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/62282f9a39c.pdfIn PDF document text
    • http://rakajipof.22web.org/chrome_latest_version_for_mac_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/gghbNif/lumberwhack_defend_the_wild_download.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/vuxidezobomakaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavasokunise.epizy.com/lusakopusibi.pdfIn PDF document text
    • http://vimadetuvawese.rf.gd/kerberos_authentication_protocol.pdfIn PDF document text
    • http://magakawigola.epizy.com/infogreffe_formalits_cession_de_parts_sociales.pdfIn PDF document text
    • http://rejaromavovelu.rf.gd/android_auto_head_unit_with_gps.pdfIn PDF document text
    • http://diverozisutujew.epizy.com/idsa_candida_uti_guidelines.pdfIn PDF document text
    • http://tupaputukexoro.epizy.com/rewinugokogafigulalep.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/asure_id_exchange_manual.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 5036 bytes
SHA-256: 19a65c2a9160ca7ad81ea60142513cf0eec468c233487d8c80bb1f8ef06986fa
font_02_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 9980 bytes
SHA-256: 011a56003fa1c672165950524fb4ecd388879ec4f6c6283432ff6865da2675a4

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