Malicious PDF — malware analysis report

Static analysis result for SHA-256 074d11881956150f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-04 19:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2e488a08b3c26549048fb08382e1678a SHA-1: 2d71e47f1bc2c60da05212d0a779ee08558004f9 SHA-256: 074d11881956150ff0124ba28863e551adee677a416b84a0b1ae5c4ce7e84e44
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is https://jacksth.ru/123?utm_term=object+oriented+software+engineering+bernd+bruegge+pdf, which is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=object+oriented+software+engineering+bernd+bruegge+pdf PDF link annotation
    • http://tejitotu.iblogger.org/lifeneworepokijopog.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/specialized_speedzone_1_cycling_computer_manual.pdfIn PDF document text
    • http://gevotumawifal.22web.org/tufurudotugezuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_fdb68c9952ac4bcdace85e0bbb6e550c.pdf?index=trueIn PDF document text
    • http://tikazujubetena.epizy.com/navy_eval_writer_sailorization_bullets.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/what_are_the_steps_of_usps_tracking.pdfIn PDF document text
    • http://welerepo.rf.gd/rasokulorakadegufem.pdfIn PDF document text
    • http://gurumuniz.rf.gd/can_you_put_a_new_cpu_in_an_old_motherboard.pdfIn PDF document text
    • http://wiximevisek.epizy.com/how_to_set_up_a_john_deere_7000_planter.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/invitations_templates_for_free.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/what_are_some_female_african_names.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_70bbdfc5eac64e5ebb42278b5b3e4246.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_ed1ec65d958c45b19e69a5b5f8d8dd15.pdf?index=trueIn PDF document text
    • http://fededajuna.rf.gd/zebigizifutuniwefenobiwe.pdfIn PDF document text
    • http://vifotuniso.rf.gd/dojazinadomigoxowilovob.pdfIn PDF document text
    • http://wabagibopuxar.rf.gd/21420927391.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/what_is_formative_and_summative_evaluation_in_education.pdfIn PDF document text
    • http://mokimonanogi.rf.gd/konafewabipokibu.pdfIn PDF document text
    • http://jupolirikajetu.rf.gd/8589107268.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/resonupimegubapejozenip.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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 5624 bytes
SHA-256: 7ff5fb3e950b8a6ae1d61b4675ccc6e2c81347721bd5d98f60e93dc5826b5029
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 11140 bytes
SHA-256: 601cd0611e24fffd32d7a4cd696a9b7368c6e317ffe87663b3f673ba62419f9c

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