Malicious PDF — malware analysis report

Static analysis result for SHA-256 233f06fe7317cd5f…

MALICIOUS

PDF

93.4 KB Created: 2021-03-15 15:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: aa251c4805f1264e1eeed26f6a570018 SHA-1: 62d737de9559b6b3345b2f81084a1e55caed3fa6 SHA-256: 233f06fe7317cd5f4949bd48d85f693aec76c493dfdb6c21d50cf9fa126339ca
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that mimics a 'Kroll background check sample report'. This suggests a social engineering tactic to trick the user into clicking the link, likely leading to a phishing page or a further stage of malware delivery. No scripts were extracted, but the PDF structure and embedded URIs strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/wix?keyword=kroll+background+check+sample+report PDF link annotation
    • https://cdn.sqhk.co/joxudilabi/9ihegie/99777648039.pdfIn PDF document text
    • http://banquepopulaire-fr.org/dirt_devil_featherlite_cyclonic_upright_vacuum_manualsi0cs.pdfIn PDF document text
    • http://fuworolimew.22web.org/funebe.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/sawasabom.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/ryobi_router_bits_bunnings.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/cjeZxij/xoxexuxukoxukuva.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/waterloo_university_map.pdfIn PDF document text
    • http://bunewumokir.22web.org/estimation_of_osmolarity_of_potato_cells.pdfIn PDF document text
    • https://cdn.sqhk.co/giwerezekobe/dgh2ij3/sea_animals_word_search.pdfIn PDF document text
    • http://digitalmicroteter.xyz/23251766339s1bpq.pdfIn PDF document text
    • http://fb-copyright-help-from.com/1152435382664c1y.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/a9cb8hh/children_s_single_bed_sheets.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/yoga_for_sports_bks_iyengar.pdfIn PDF document text
    • http://motirepefasake.iblogger.org/live_streaming_video_android_github.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/how_to_put_elgato_on_obs.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/faluzotixupi/72369272952.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/71843937033.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_6a85a6d6c6da4bb6a53c5b2aa773ea2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/cartoon_photo_filters_pro_apk.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/what_are_the_stock_futures_for_monday_morning.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_db7930acff6b42d5958958137cd2bd87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/35632914420.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_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 5660 bytes
SHA-256: 92e5223122b49cb567a9dc9b0bd60a6214abe63ae3e0f4b6fc4d797283db6999
font_01_sfnt_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 11120 bytes
SHA-256: bfe803a0e254f9460589f57f7da067fb33fb9fd453b2aa04b1b46e52786a930f

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