Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1005b71afdeb02…

MALICIOUS

PDF

96.7 KB Created: 2021-03-31 03:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53542ee9ab9681feda6ecf8ec3bebe34 SHA-1: 16a92c666ba61690ae384d590a7827f21dcc623c SHA-256: 4f1005b71afdeb02cf80cf6ddc30f6a6d1f098177f10191d8d55c78b460620d2
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 0.9998

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://baarspo.ru/wix?keyword=pathfinder+best+valet+familiar PDF link annotation
    • http://gazeloguxa.22web.org/oxford_picture_dictionary_second_edition_opd.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/wagasakadevexu.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/bokimumopapejep.pdfIn PDF document text
    • http://xogezile.66ghz.com/xabipibexage.pdfIn PDF document text
    • https://cdn.sqhk.co/sofawaju/T6j0Njf/lowriders_and_bombs.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/phfgijc/30560860696.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/5HBbFhf/bass_guitar_tuner_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/podiwilur/jfqxphh/roganofu.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/VWgcB0h/netflix_series_dark_cast.pdfIn PDF document text
    • http://puviwaxeraw.22web.org/bsc_agri_application_form_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bimowikosaru/hhYLjiF/best_tuner_pedal_for_acoustic_guitar.pdfIn PDF document text
    • http://kilekapalovuzo.getenjoyment.net/tasokovorabej.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/Hic0ih3/axes_io_apk_hile.pdfIn PDF document text
    • http://vovality.club/58054294207r8m1p.pdfIn PDF document text
    • http://kamini33.ru/27479191355mscr3.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/wivunonovef/lofitozosowo.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/43034774355.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/70238048516.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_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 5348 bytes
SHA-256: b1b0ca8a195bb09525cf557bfbea571452b03728ce4dac662318f3eb37dac74b
font_01_sfnt_off000150ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CE 10932 bytes
SHA-256: 3dad27cf8679fe0a8fdb9cbd6434dc47f4f35d00b6278dae1da5ce397db06354

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