Malicious PDF — malware analysis report

Static analysis result for SHA-256 be328808ebba8740…

MALICIOUS

PDF

76.8 KB Created: 2021-04-08 00:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3b817e965c3bc496f55000c89163e258 SHA-1: 8906f904ec9890862042424e2488ae94d3986cfe SHA-256: be328808ebba8740c3c5b9169e7faf11560a8bf2d1cf791cd73b46b227fc497c
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with one prominent URL pointing to a disposable domain, suggesting a link farm used for redirection. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external links points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=grandstand+radio+guide PDF link annotation
    • https://cdn.sqhk.co/zisubiziwu/gKg8ibM/cozi_family_organizer_download.pdfIn PDF document text
    • http://womuvizitina.mywebcommunity.org/historia_del_liberalismo_economico.pdfIn PDF document text
    • http://mazezoda.22web.org/wakimitizada.pdfIn PDF document text
    • http://rivokalodusi.sportsontheweb.net/88122534304.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/59027113502.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/j9jgjjn/86446810415.pdfIn PDF document text
    • https://cdn.sqhk.co/dedomafub/anifieO/drawing_board_definition_short.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zesotat/java_gui_components.pdfIn PDF document text
    • http://pasivete.epizy.com/48971805980.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/gidumexubutawobop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23663041-6b0e-463b-a040-fb4b0589df75/negative_binomial_regression_spss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5365120d-d2e0-4e1c-90af-55364247c0d3/vinurivevepizudekuz.pdfIn PDF document text
    • http://dizoterimivitap.rf.gd/xitibof.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/lesson_plans_template_for_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a3b51d-5bc5-4f97-941b-155d49d6f07b/hp_laserjet_m1212nf_mfp_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783ba175-83d3-49e9-9fcb-9493d67bbbb3/gigozepeguzal.pdfIn PDF document text
    • http://somasetowijo.myartsonline.com/zivuzurevow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00f5127-ab08-45e6-b354-860b7f1eeb82/vasirunilino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a05999-6294-43b7-a85f-c0182dc6fcb7/91892658153.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/wudati.pdfIn PDF document text
    • http://kajalefaruw.epizy.com/5005774940.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/gugexidudonesozabuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c187f4ac-2c7d-4c64-bf08-c094ea4a53ec/sifesej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41387bae-a81f-424c-9a4e-c66927d00c4a/attack_on_titan_season_2_english_dub_funimation.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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 4992 bytes
SHA-256: e84508ae359de6cac78ec91742b9d2319c378162a1e5232e98110ca0c1eb2caa
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10820 bytes
SHA-256: c58d8e77d6024bb56fd59b5ba660efdd9aa27cb635ca97b2b0b8964b02829dca

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