Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a1f7a32e649351…

MALICIOUS

PDF

86.9 KB Created: 2021-04-02 22:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 345a57d9a52ed99ef56469ea03f6ebd9 SHA-1: df092d69daca229e12e3a507f6f9025b590a7cdd SHA-256: 79a1f7a32e6493518883ba8b503a537141f2872a01c50cdb1b0549b05dca0958
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • 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://druttle.ru/award?keyword=vex+robotics+engineering+notebook+pdf PDF link annotation
    • http://b4shop.icu/gezazivobixajusodenhe7l.pdfIn PDF document text
    • http://wimebenese.getenjoyment.net/definition_of_comparative_public_administration.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/ghVjhBi/xinagupaj.pdfIn PDF document text
    • http://sizinepizot.scienceontheweb.net/lugutavisajitenonamexu.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxojuvef/ifeDQib/14806035705.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/toruwog-zesusarapalaw-mivazimu.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/gawuvunubujo.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/gekutafavarelix.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/5084430226.pdfIn PDF document text
    • http://dostafood.xyz/desiderata_max_ehrmann_19274gici.pdfIn PDF document text
    • http://vedice.ru/jenijubofosivemunbfio.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/KmjfjjG/79747857728.pdfIn PDF document text
    • http://basiditdcf.space/vabof7uupz.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/8226261.pdfIn PDF document text
    • http://afracheat5.xyz/bugupesokignzwz.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/2bab348aa329c4.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/chemistry_notes_for_class_9_in_urdu.pdfIn PDF document text
    • https://bajawefigorega.weebly.com/uploads/1/3/5/3/135339811/wubuvelukav.pdfIn PDF document text
    • http://kexumojazo.mypressonline.com/castration_of_cattle.pdfIn PDF document text
    • http://lugabev.mygamesonline.org/knee_arthritis_exercise_program.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_4c851af563bf4208bab256715190172c.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_2cbc66fd3bab426a8f77b68ac10667bc.pdf?index=trueIn PDF document text
    • http://toxifiv.myartsonline.com/gujarat_map.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_95c4dd7024d8456cb743850e82868afa.pdf?index=trueIn PDF document text
    • http://vujadexofon.atwebpages.com/el_chac_mool_cuento.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_1819518c18f04b67bacfdf267a310d2f.pdf?index=trueIn 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_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 5320 bytes
SHA-256: 454edb441d0a6c2b8c6bd1379837a9d2524cefa8fc5c8e0ffc8d713b98fa3ddc
font_01_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 11260 bytes
SHA-256: e80d0e13d5f9969fbfc331a61e305548d72b8915a584b5a8998b73dd32b60c97

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