Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c48955b987cf8b4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-12 13:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5ed3a891088c4d979dacf60a569b6382 SHA-1: 9d0d596aedad4be70c4c8cc127c6a9196eead8b6 SHA-256: 1c48955b987cf8b43d3aa172f01ca932590285ffd1aaf6c6fc7e9c00662c2c8c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://bologen.ru/123?utm_term=18+birthday+images++free PDF link annotation
    • http://fexabudobix.getenjoyment.net/tetodebojixoruwedadoserap.pdfIn PDF document text
    • http://lugabev.mygamesonline.org/kenmore_elite_smartwash_quiet_pak_9_error_code_dl_f.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/majesty_sheet_music_free.pdfIn PDF document text
    • http://menedowu.iblogger.org/linux_command_line_to_png.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/72145990533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaa2c4e-4601-482b-ac43-a99a5ae993bf/zilekumoduzebezaw.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_e07d4126999248d587afeb754cf0bbd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0f9549-add2-4bb4-b816-93b17d3cb2f4/how_to_set_alarm_on_timex_t235_clock_radio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885300fa-7d68-4429-886d-a10d0b306814/oxford_current_english_grammar_in_hindi.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_116501f2c97446be8412a7bc5278def1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/vemosufewelutebit.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/cultura_angolana_resumo.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_449cf633124e467fa6e3d7e725525343.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/used_jotul_602_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c344b2-a559-4d0a-8a56-2a17c6a6fd2d/zozumegubutoxekubisaxexa.pdfIn PDF document text
    • http://setovoj.onlinewebshop.net/30_day_squat_challenge.pdfIn PDF document text
    • http://sovizaz.epizy.com/como_o_picpay_ganha_dinheiro.pdfIn PDF document text
    • http://delusasad.rf.gd/pitefopirenexukozavixifif.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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 5680 bytes
SHA-256: b161fe5efefa2a1bfb6bc45c4eb64e465711cd67749eb048e952ad3c5f5df34c
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10960 bytes
SHA-256: 6942b0a4f1457f8489cba8bc7a268250a8462185f386d1b65690ec3362f4bdc2

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