Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97cb8f5a40d0ec7…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 17:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0fbc0d67118792df76bad97aa95dfb6b SHA-1: 16cb68db8c2a176cde7957a090e6628fb7888601 SHA-256: b97cb8f5a40d0ec7ac406c625069b44eb1e345067c8d4928de6d0e7d70e1a7c3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to 'The mortal instruments tv series season 4', suggesting a lure to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+mortal+instruments+tv+series+season+4 In PDF document text
    • http://momarivido.mypressonline.com/manual_de_organizacion_y_funciones_empresa_privada.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/veguxopofetukosit.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/call_me_by_your_name_watch_online_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iie7AKF/47879407697.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/hKtDSrd/fizumixutupomaf.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/vhipNwZ/36732782883.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/17188019808.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/nasb_macarthur_study_bible_2nd_edition_premium_goatskin_leather.pdfIn PDF document text
    • http://emmetrix.net/zuxogunanurdwta5.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/why_is_he_suddenly_distant.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://girofili.myartsonline.com/96649490185.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/kadeputa.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/71658754561.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/chrome_adobe_flash_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/annual_return_form_companies_act_1956.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/fitted_bed_sheets_for_king_size_bed.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/persona_4_golden_achievements_steam_guide.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 5024 bytes
SHA-256: d4381ba6eb65d31dbc210f7f644bd976222fe1594447498a45c14ee276440876
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10188 bytes
SHA-256: 60475baeffbaddcfff8737c371e64083408eccf7e887cf20e45f8dd17c5365c4
font_03_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 5736 bytes
SHA-256: 9e581d13123d968e0e94e193714c7a9795f866191f947e70b4f42d939a3906db

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