Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0ff387bc3b5da3…

MALICIOUS

PDF

94.3 KB Created: 2021-04-07 13:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5ab003a0ae85ca63d05c92510af91097 SHA-1: c81624d8e4cd5c054076230d3a00a9e6ceaf2e2f SHA-256: aa0ff387bc3b5da3f6f80ca41eff2de5689a806fb15567fa6d4b764651b18b8e
216 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a brand-impersonation credential phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to redirect users to malicious sites, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/temugirenasanuf.pdf.
  • 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://resalured.ru/123?utm_term=1-+99+fishing+guide+rs3+2018 PDF link annotation
    • http://nonretloli.site/81128983437iqkgm.pdfIn PDF document text
    • http://gabasikekapubul.iblogger.org/abiotic_and_biotic_factors_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/Ahc7kRV/hard_candy_molds_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/Cibgijc/43343611700.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/temugirenasanuf.pdfIn PDF document text
    • http://com-signto2.xyz/sasikala_charthiya_mp3_song_downloadgop0d.pdfIn PDF document text
    • https://lulaxifijugom.weebly.com/uploads/1/3/0/7/130776747/buzofanizu_kadepapugatiwab_zokazilitev.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/waverekibus.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/wewefuxizoba-raxukan-gexik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevovodoneto.epizy.com/68855098184.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/goxafekofuluvera.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/72644580663.pdfIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_ffd5ab88910342598b085d476a696011.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/area_of_polygons_worksheet_6th_grade.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_bfaa1a7cf5b7447f940c49480d4c6e8f.pdf?index=trueIn PDF document text
    • http://xuletesowugi.epizy.com/new_bhojpuri_album_video_song_hd.pdfIn PDF document text
    • http://mojamolo.rf.gd/how_to_manage_disruptive_classroom_behavior.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_03b4729b7a1c4ef390b2504d3a64f0a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/61960182296.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/45789111806.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_376570e470bf414e908f28b17204f444.pdf?index=trueIn PDF document text
    • http://bufisilozo.rf.gd/libro_los_compas_y_el_diamantito_legendario_gratis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 5704 bytes
SHA-256: 0edc7581bfa8a03af3a64a5a053495b8bfc8f1567b6c15c6aa3a7b7bc5ff3c4c
font_01_sfnt_off00014327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14327 12164 bytes
SHA-256: 38d6e6cdf0a665486f4b958587c5d5d24c85780b5d5c7a3e2baa62ddd4ba5432

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