Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5c525eb4a99e42…

MALICIOUS

PDF

70.0 KB Created: 2021-04-01 22:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2a81d10ef4b6dbeb45c4874232a0d9ed SHA-1: 9c6eeb77a12c05e16cc01f4601881f0d247f986d SHA-256: 4e5c525eb4a99e42179e1b04cc4a005ca65593fe4946ebdc59b4416d0337e645
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary goal of directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. No scripts were extracted, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/award?keyword=thinking+in+java+solutions+pdf PDF link annotation
    • http://helpverifedbadges.com/marked_by_king_bs_answer_sheet9hkvv.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/d8heyja/adventure_landing_raleigh_prices.pdfIn PDF document text
    • http://fitokaps.xyz/highest_usmle_step_1_score_2019g86k6.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/gbgf5jj/asteroid_crashing_into_earth_movie.pdfIn PDF document text
    • http://souve.me/camilo_y_evaluna_se_casaron_videoizpby.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuziwi/jiic3ja/98108766710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_39f39c154dd24b8f816843ef3973339e.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_3ad4ce53eff1463eaa3aafcf3eb1fa45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/examples_of_gatekeeper_genes.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_352d44da661e4608bdf3f4837709ba9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/addition_and_subtraction_within_20_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/pioneer_avh_x1500dvd_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/clasificacion_de_las_cuentas_en_el_estado_de_resultados.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bin_sachivalay_clerk_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/latemidexisene.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/adelaide_tv_guide_sunday.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/beginners_guitar_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/54323404143.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_0092e8afb00a429b9cfbfbb526ff1bda.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 5356 bytes
SHA-256: b2ef1ee7e70257b3d64c90b3afede4100c8eb3c07260211226cd3ae81c8615aa
font_01_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 10864 bytes
SHA-256: ccecb5da71b05cb4cd1f3741f23d96a841f9c7485e24ae385ffafa79d7bfb3c2

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