Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ddfc4510e65a81…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 22:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ce963ee6972f4822298effe0c827d2 SHA-1: 783e07faf79673f08f4a71d0ec02e8b80a5815db SHA-256: 08ddfc4510e65a819bbdbf6c6fc686597f9d5f5a3dbca280fda47684031dd988
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soxebez.ru/123?utm_term=herramientas+del+diagnostico+organizacional+pdf
    • http://lesorurudefige.iblogger.org/formas_de_preparar_chorizo_argentino.pdf
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/ed0534109e3ea1d.pdf
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/wujolaginu.pdf
    • http://fepegabilufe.iblogger.org/jevaxavakowunumugisixete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_e6d74d876e7c447f9315e99f0489d4d6.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_e227b5a7954546e29e160a6433564282.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_14cd41e0959149139bcd79b09c8cbcd2.pdf?index=true
    • http://wusipoz.rf.gd/does_bleacher_report_live_cost_money.pdf
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_0ddb533041574687a891fff9333c0b1b.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_27db86d2a4b4405fbe48109602a8a8c3.pdf?index=true
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_8b64ca4de6954c40a391a137b19fcf31.pdf?index=true
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_288aa044809b4d46acc443fc1c7b02d8.pdf?index=true
    • https://s3.amazonaws.com/nuxomigo/tiwepisedurezaxufedun.pdf
    • http://lenamopotinapar.epizy.com/d_d_pathfinder_barbarian_guide.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_5fc582f8066a4fe6a51634526daedd12.pdf?index=true
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_8e0cacd310dc46059df61268d7c2dfb5.pdf?index=true
    • https://s3.amazonaws.com/dejazuvorira/who_does_ren_amamiya_end_up_with.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/2013_lexus_es300h_fuel_economy.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/body_building_exercise_at_home_without_equipment_full_hd.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ce.bin
570b804f40cb916c8c511d920b79987b2f06dc4bb5a6597c29c202f9a3ee4a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5484 bytes
font_01_sfnt_off00010668.bin
5caaebe4de30a2da4fd56a54935006bcb213f834c752233cc855d5429d696f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 11592 bytes

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