Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3f13ad66463542…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 07:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 27a3c9fadbbf2daecbacfd0852f463ac SHA-1: 25a5ec80ed0f1f1019a9c050680e9340eca35027 SHA-256: 8a3f13ad664635429be61bf7560c879105fdc8b2e20a33d9336ab9208d024779
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as search results, with a high concentration of links pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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/strik?utm_term=lg+washer+leaking+from+drain+pump+filter PDF link annotation
    • http://meetsalle.xyz/dell_precision_m4800_battery_not_charging3igd1.pdfIn PDF document text
    • http://maewallace.com/jusunikexizobapulan4gpve.pdfIn PDF document text
    • http://filfex.ru/harry_potter_and_the_sorcerers_stone_minalima_edition_harry_potter_book_1_volume_1_bookz4ef0.pdfIn PDF document text
    • http://fbdirect.site/37143201238uy4yo.pdfIn PDF document text
    • http://smartline58.ru/275632769297pea3.pdfIn PDF document text
    • http://titoto.xyz/batadoxogunutixlveb.pdfIn PDF document text
    • http://qlemelest.online/introduction_to_social_psychology_hewstonegyxnp.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/jadowasasedim-jazapi-wugezu-meregobiregamu.pdfIn PDF document text
    • http://gtomishebs.xyz/john_deere_14se_service_manualz4j5i.pdfIn PDF document text
    • http://koreatop.ru/jezapozelofunilklz.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/domatefezabubimop.pdfIn PDF document text
    • http://deflecfcvy.best/xijewigupotilaturwcna.pdfIn PDF document text
    • http://vivadoctor.ru/today_fm_d_is_s_wrong_answersn9f5u.pdfIn PDF document text
    • http://afracheat6.xyz/gnostic_infancy_gospel_of_thomashe8n3.pdfIn PDF document text
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/kidanoz.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/7261835.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/6693696.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/apache_2._2_for_redhat_linux.pdfIn PDF document text
    • http://mon-cmso.best/kepimebasidemutilezafu8yidz.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/xesevaxelut-solebox-mubixakemakov.pdfIn PDF document text
    • https://vutuwibomakupir.weebly.com/uploads/1/3/2/7/132740747/3137003.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
    • http://telisidaz.epizy.com/how_to_use_casio_fx-9750gii_calculator.pdfIn PDF document text
    • http://lifukifeja.epizy.com/61679031157.pdfIn PDF document text
    • http://dibixigux.rf.gd/62015891670.pdfIn PDF document text
    • http://wofelekupobepo.epizy.com/ecological_succession_worksheet_answer_key.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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 5432 bytes
SHA-256: f5136c13f327f7500276ec2c4a6422b9d5beb4540d8ac3f21d411bcd0e27b636
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 10796 bytes
SHA-256: 1797254326ffa71e5b19b8aa1378e0fb539063b4c00d962e8dfb41fe40241b88
font_02_sfnt_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361