Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3e70c7d48088e2…

MALICIOUS

PDF

76.8 KB Created: 2021-05-13 22:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8a04bdb8877b6c33e1c1b0053c22bff3 SHA-1: 2d3058a5c0f6c917ee30f52c1e190a145bbb018f SHA-256: 5d3e70c7d48088e20e3e3b3d6473604d9617c8938307398e95785a8b3ad1f34c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=is+gap+worth+it PDF link annotation
    • http://zixudivibudizu.scienceontheweb.net/87758922931.pdfIn PDF document text
    • https://cdn.sqhk.co/jesarijufe/7ggjcjf/sonny_kiss_engaged.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/gj0aeQk/spirit_animals_book_series.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/rozaxaz.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/d1747ac53735.pdfIn PDF document text
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/6203813.pdfIn PDF document text
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/1797282.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/cif9a0L/civilisation_6_new_expansion.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/gchajjM/spider_solitaire_game_download_for_android.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/arterial_blood_gas_sampling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dazejifudora.onlinewebshop.net/makalah_abortus_insipiens.pdfIn PDF document text
    • http://jaferojizewawer.epizy.com/baldur_s_gate_avernus.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_02a1e15f182d45e792dc96feb6133840.pdf?index=trueIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/bernard_cornwell_1356_download.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_4b0681be58b34f6c8728aaadb1e123cd.pdf?index=trueIn PDF document text
    • http://bimibukiju.rf.gd/81955624357.pdfIn PDF document text
    • http://konazosite.epizy.com/one_night_at_call_center_novel.pdfIn PDF document text
    • http://donolipapaxe.rf.gd/87560395917.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_d6d0aafe76774f00acb8e657c821f58b.pdf?index=trueIn PDF document text
    • http://nejimafalun.onlinewebshop.net/58478217530.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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5076 bytes
SHA-256: 5573f218b6bf51e7ddee115b2d7d23f35d4ac3f3a0e51c149dbba2be7e81c131
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 11548 bytes
SHA-256: ba3794d184a55d773ae43c62ba9cb96c303d943ca317eb8c8f131ac63d132315

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