Malicious PDF — malware analysis report

Static analysis result for SHA-256 09203e7cd420468c…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 19:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5d1bf789acb75b3db67f63dfe5e732a0 SHA-1: cc5b0134a60b781f2dad8ddffbd644ed06057d61 SHA-256: 09203e7cd420468c8241a6cf2bb3c0e34f30726ad346ad46abb2ea93fec8a4de
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are SEO-optimized and point to redirectors, suggesting a link farm or phishing campaign. The primary URL, 'https://kuzutuzo.ru/award?keyword=human+anatomy+and+figure+drawing+pdf', is presented as a lure for relevant content but likely leads to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://kuzutuzo.ru/award?keyword=human+anatomy+and+figure+drawing+pdf PDF link annotation
    • https://cdn.sqhk.co/mujawiru/hOjjifp/spacex_starship_interior_volume.pdfIn PDF document text
    • http://uabiomanix.xyz/jiu_jitsu_techniques_bookjren6.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/b6gfGha/gidavoterezop.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/2966513.pdfIn PDF document text
    • https://cdn.sqhk.co/kutagigixef/gieidhe/81958559733.pdfIn PDF document text
    • https://watoniworawi.weebly.com/uploads/1/3/4/8/134871767/mafifagumo.pdfIn PDF document text
    • http://clientesdkb.com/cyberpunk_2077_ps4_vs_ps5_side_by_sidev3b5o.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/ximev.pdfIn PDF document text
    • http://vinnipoh.space/23936334833rt8sy.pdfIn PDF document text
    • http://opencabinets.xyz/employment_authorization_card_renewal_formafnwt.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/zudexuw-kolobifon.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/mobixokexodipepeto.pdfIn PDF document text
    • http://filanion.online/video_cutter_and_joiner_with_crackq6h24.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/a5119.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/9822826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/padanivozeb/follow_up_meeting_notes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/cell_structure_and_function_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/lathi_modern_digital_and_analog_communication_systems_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/extend_probation_period_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/xunegugabetobogisuxod.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/varicocele_symptoms_merck_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/65315478461.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/woriz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 5188 bytes
SHA-256: a7f18943ff715bf12968f85a08ca40aca915dd12af0456d4800fce94f293de3c
font_01_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 11056 bytes
SHA-256: f2093b58b67e79fe4d450afd8ec09b2538c9fa8d7f64666f6eea93fe984c99d6
font_02_sfnt_off00013438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3