Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f4a456539eebf7…

MALICIOUS

PDF

87.7 KB Created: 2021-03-28 21:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c48ccfa8817b3b84cddebba34c35bd3c SHA-1: 5ac5ce41059ecfca44b29c0a1c6bcbd5e757c6ea SHA-256: c8f4a456539eebf7071ca5568aa37f966d554f68b66957a8683525849852bfbf
126 Risk Score

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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=basic+electronics+engineering+text+book+pdf PDF link annotation
    • http://tafugegajotu.mygamesonline.org/lenovo_thinkpad_t430_bluetooth_driver_windows_7.pdfIn PDF document text
    • http://werenntaq.online/free_printable_atomic_habits_worksheetsa0joc.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/KYQjhMh/texas_longhorns_logo_images.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/m5ghmhj/write_down_notes_meaning.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/borgman_full_movie6m9wm.pdfIn PDF document text
    • http://csxmoney.info/initial_sounds_worksheets_for_prescht35d7.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/adobe_reader_free_download_latest_version.pdfIn PDF document text
    • http://belofakomag.mywebcommunity.org/kikogobudipavuxogajomi.pdfIn PDF document text
    • http://pojibuvuj.mygamesonline.org/affairscloud_static_gk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/big17jb/piggly_wiggly_lafayette_sumter_sc.pdfIn PDF document text
    • http://twoup-viktoria.online/saxon_algebra_1_2_test_answer_keygajr0.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/ezdrummer_2_file_size.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/english_course_for_adults.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/donake/fipeli.pdfIn PDF document text
    • http://xodojekupelofit.rf.gd/gozopup.pdfIn PDF document text
    • http://totiwofosu.epizy.com/ct_coronary_angiogram_report_template.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/ignou_assignment_front_page_file.pdfIn PDF document text
    • http://dalewofom.rf.gd/putosek.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/nipuxenav.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/english_grammar_personal_pronouns_worksheets.pdfIn PDF document text
    • http://lugaderova.epizy.com/sudomo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 5432 bytes
SHA-256: 9fae5b3c96f422bcdd0903f1cde27c48b7616026a0346a840f6a38ef50a245e2
font_01_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 10324 bytes
SHA-256: ecd4a1ccbded8bf92ca0e82b6ed6bf5f35c6fd0d39f5c3384aec5f9cfc1dd2ed
font_02_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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