Malicious PDF — malware analysis report

Static analysis result for SHA-256 39637215e8b11cfb…

MALICIOUS

PDF

79.7 KB Created: 2021-03-24 20:37:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 33cda6dced37bea32c8dccca7d6d42be SHA-1: 3e71ffff87ebd22918d59a342b780bbb68a8d04f SHA-256: 39637215e8b11cfbcf4262bc3367c4da76017531038200964100add8a22888ab
126 Risk Score

Malware Insights

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

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 0.9994

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://jottigo.ru/wix?keyword=icon+pop+quiz+answers+characters+level+5 PDF link annotation
    • http://bcpzonasegur4viabcp.com/weider_8630_cost3s34n.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/38365749027.pdfIn PDF document text
    • http://bristol-yalta.run/how_do_you_take_apart_a_keurig_to_clean_itefmgc.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/1gj0gjB/95832397708.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/vidonizaloxidoke.pdfIn PDF document text
    • http://ita-women.space/xufejiwoj6lwzr.pdfIn PDF document text
    • http://livecopyrightverification.com/zipikobosurirogaxivtdgot.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/ihaBhhj/fizz_runes_league.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/Mjhgeji/fitibadovalatipodofije.pdfIn PDF document text
    • http://mexicotop.xyz/what_is_a_legal_last_will_and_testamentnaf87.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/jehcjjY/sky_force_3d_rutracker.pdfIn PDF document text
    • http://fishland.store/fajusijijuwafjzr94.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/examenes_cae_con_soluciones.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/muzozalur.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/recitation_of_quran_by_qari_abdul_basit_mp3.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/gulefavadujuvupawgcho7.pdfIn PDF document text
    • http://znalomstvavip.site/how_do_you_describe_the_great_lakes_are_there5x57j.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/oifgitw/cute_hairstyles_for_little_girls_with_short_hair.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_74bf1e24013444788ba4aa3eeda1dd57.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_68cf2dc984cb49829ed4442177cccac5.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c1b247848bde4598b4ae2aa4fdf2afe9.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_a20a9cb8f9fe46bfaab239be7c4c5d1f.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_88a8d73849124a6b85b3db4dd4a3e9c4.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_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 5412 bytes
SHA-256: 8e98fe58fd8339bdd72a582f4fa6fdacd0f4a102107393c334fc4e1281f1dcb9
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 11384 bytes
SHA-256: 108199fc6af7bfd10be9fbf8220888bc0412b8a4f6485aea40606c4927f3bd5a

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