Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5668b1749ac30e2…

MALICIOUS

PDF

88.0 KB Created: 2021-03-17 22:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f571be2948e6aabe2569bc91b0b3509b SHA-1: bd980f832b8a866ff3710d8fbff4efa226823874 SHA-256: a5668b1749ac30e2af28bd9a9efe1d51c105c9bcc9e101fedcb12c9c7f1d14a5
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external resources, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting point towards a tactic of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=calendar+2020+pdf+download PDF link annotation
    • http://ninuxalezopo.getenjoyment.net/wagegopivo.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/54033872204.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/51474542138.pdfIn PDF document text
    • http://gobitujesan.scienceontheweb.net/52113419951.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/teoria_de_enlaces_quimicos.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/5029931162.pdfIn PDF document text
    • http://itverys.space/909487275833gbhj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_600924b216ad8.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/king_james_bible_genesis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464850/normal_5fef5b376303d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443329/normal_5fcb7572e5afc.pdfIn PDF document text
    • http://triple-doska4.club/rubik_s_cube_guide_2x2315le.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/gugofatekugofa.pdfIn PDF document text
    • http://svoylend.xyz/bits_pilani_dubai_application_formk3id5.pdfIn PDF document text
    • http://interstart.online/965195914942h9yt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_f10c2149d7614d048b1a74add29aa2ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/korarapuxuwufepobepu.pdfIn PDF document text
    • http://tofalit.myartsonline.com/17978704400.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_49cd06bbfd9a43bf95ca36f11895c409.pdf?index=trueIn PDF document text
    • http://furunes.onlinewebshop.net/king_wrote_letter_from_birmingham_jail_in_response_to_what.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/poteker.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_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 5128 bytes
SHA-256: a05310f097a204372d168f9fc1fb250ea35981713cac149246356819d861d77b
font_01_sfnt_off00012c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 11236 bytes
SHA-256: c877d82015b6fd12120e90aa7e3237f4205e2dda50a4d9373cad97cbd4332b4b

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