Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9ed2c29e9aa242…

MALICIOUS

PDF

75.0 KB Created: 2021-01-23 17:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ba9dddcf7a84262a250d3dd9e516c1ab SHA-1: e0b0692ab953aecc35fc582c26fe78af5466858d SHA-256: 8c9ed2c29e9aa24215b1f10dddf294fc097c7c8c3dd91305d55c178e31062539
136 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a heuristic indicating an SEO redirector link, specifically disguised as a lure for 'cartoon stories for children'. The primary malicious indicator is the external URI pointing to 'baarspo.ru', which is likely used for phishing or to serve a secondary payload. No scripts were extracted from this sample, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=cartoon+stories+for+childrens+in+english+pdf PDF link annotation
    • https://site-1180061.mozfiles.com/files/1180061/64086240431.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/puhe29a/tornado_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/cic64ig/3d_tennis_clash_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/ghyubjf/gukizavatusodibivazu.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/fhif5EQ/amtrak_phone_number_in_sacramento.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/ioQhaie/scythe_digital_edition_multiplayer.pdfIn PDF document text
    • https://site-1171473.mozfiles.com/files/1171473/69265954203.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/zibenoroduzuw/descargar_astro_file_manager_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/email_signature_design_templates_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/fast_internet_access_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/landing_page_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/lista_giocatori_fantacalcio_gazzetta.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/tuberous_xanthoma_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/ny_driver_s_permit_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/mathswatch_angle_sum_of_polygons_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 5320 bytes
SHA-256: eaba69915d5b0d06ea715c7a0d54c578fbedbacb5444e9aa173f4047e547a821
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 11068 bytes
SHA-256: f655adb26275e72671fc8229a9bbff32b7fbd00617c5e96d554f62d422b6da1a

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