Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f45323ba751c1cc…

MALICIOUS

PDF

76.5 KB Created: 2021-04-01 11:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5fa30224195d4f0cf9d7aabbd808dd63 SHA-1: 9898f3d357f8524aee6ed86408064570da7fbdf9 SHA-256: 3f45323ba751c1ccd30974c98eb5755ab269142da861605a4a858064631fa678
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic findings of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards an attempt to drive traffic to potentially malicious or phishing sites, disguised as a definition of 'Lenguaje binario informatica'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=lenguaje+binario+informatica+definicion PDF link annotation
    • http://bandalet.club/acrostic_poem_template_free_printablezckzi.pdfIn PDF document text
    • http://adr-media.work/somotugajunonogalatinzk0bk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409606/normal_600753b2b5c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_601a99e40c939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_60599f9112284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_605b9a191efe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_6037cbe83dc76.pdfIn PDF document text
    • http://xisubov.iblogger.org/bible_verse_of_the_day_kjv_email.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_5fda78618ab77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_38fbaa5a47914c2298dd20c1213ee8a8.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_b160235cc784460f9a69cee661cabe1c.pdf?index=trueIn PDF document text
    • http://xedonufil.rf.gd/the_good_witch_series_episode_guide.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_e321866e13fd41f0bcff96149efcd3ad.pdf?index=trueIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_dd1ff9433e6b4bd5bd90381f2ca7a7ee.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_fc59626af1e1488a8b1fd31314025526.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_bdb8aeadb6e940b2ac4151479e80d56b.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_a98e226ec38f4877a4dc46a5d3cf9a87.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_4d25bdc5d0f645aaa380aad1773997ad.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_7ef9c04f420d41f29c9e89513ae52533.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_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 5288 bytes
SHA-256: d75ab9ab265d64196c8fdf7fbdbc71052018c9396598b92a40222eb101ee5329
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 12420 bytes
SHA-256: 539d419a940f02af7f7ecf55b929eab208722ab220c519d276509464379e8019