Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cf335dbf002fa1…

MALICIOUS

PDF

80.5 KB Created: 2021-03-30 13:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b8f517077a7b92809ec9e87375f7d029 SHA-1: 999f9ed2ef62d254bdf1b58b49e618f7a2b8998b SHA-256: d6cf335dbf002fa10382fca2fe4633693cc6e3e560c0a57e9fe5be90a50543ce
186 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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/123?utm_term=baghban+movie+song++webmusic PDF link annotation
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/bozojuv_lobozu.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/65682300913.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/faiftia/56485940297.pdfIn PDF document text
    • http://samabev.iblogger.org/nys_driving_permit_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/0idgehh/multiplication_color_by_number_christmas.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/work_breakdown_structure_example_for_construction.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/what_punctuated_equilibrium_mean.pdfIn PDF document text
    • https://tupeduwexawagov.weebly.com/uploads/1/3/1/6/131607208/1036599.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/exam_master_september_2020_download.pdfIn PDF document text
    • http://ratapadeko.22web.org/dessert_business_plan_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokepomi.onlinewebshop.net/mecanismo_de_accion_de_los_hipoglucemiantes_orales.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_c49a12e30d7e4cf6ad93cffb29259852.pdf?index=trueIn PDF document text
    • http://wipibefab.onlinewebshop.net/litamenokegisi.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_04a80f69418b4e7d954a8780b82c7861.pdf?index=trueIn PDF document text
    • http://maxitopatedawo.rf.gd/32180061746.pdfIn PDF document text
    • http://novuvajuvenexe.epizy.com/sopazuzoxitaru.pdfIn PDF document text
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_680d9d7d73d04bbe9889252916cdb23d.pdf?index=trueIn PDF document text
    • http://lebusepuwiri.atwebpages.com/bjcp_2020_portugues.pdfIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_efe17868eff84698a1bb51c48ebc7e48.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_3822031b174e4c8f8eb2d718762b00d5.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_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 5424 bytes
SHA-256: 07e8649fa6ae7d5413fb45f899d39cfe1aac0f527e32c3977748e5c892c8d151
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 11556 bytes
SHA-256: 59b2291309b390a8d877dfc28377f8bf291de95f463fd4030d798515d793bf4b

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