Malicious PDF — malware analysis report

Static analysis result for SHA-256 905a20d689dc9006…

MALICIOUS

PDF

78.3 KB Created: 2021-04-27 19:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d62d07fc93bbc362a3dd42675ba3f79 SHA-1: 7415ace5c5a0b964ffd6b49f7b1dbe26184a4d2f SHA-256: 905a20d689dc900663d57f81ec1c7d90e3a5102be7d71f837f97808d122ee756
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, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=are+there+any+sewing+machines+made+in+america
    • http://coupons2020.info/tijakexavafusegutaweg1cxes.pdf
    • http://javefuxola.getenjoyment.net/annexure_5_form.pdf
    • http://english-10.site/breeders_of_nephylim5fgyq.pdf
    • http://hq-cleartv.info/hummingbird_fish_finders_side_imaging_reviewsfuvz0.pdf
    • http://resapus.scienceontheweb.net/pdf_to_audio_converter.pdf
    • http://tixesikixux.mygamesonline.org/60506194153.pdf
    • http://beamorem.com/teaching_feeling_1.9_mod_apkghnjp.pdf
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ff428db00406.pdf
    • https://cdn-cms.f-static.net/uploads/4370077/normal_60120bffcb0b6.pdf
    • https://cdn-cms.f-static.net/uploads/4474205/normal_5fd264a15a100.pdf
    • http://eurofamily.pro/how_to_address_letters_to_irelandmy91p.pdf
    • http://natikolom.site/draw_a_person_test_4_year_old0kdhk.pdf
    • http://bupro.asia/43586274811af9cy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_360e207e25c44b318b3de01f9da10c0b.pdf?index=true
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_7db67d45244c414abe42407fa3905fe2.pdf?index=true
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_8fd0475a184b432988852b5ebfa572a5.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_f8973f751f06406388fb2b66d2a9df47.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_b7846c888ba946be81208898e55a2b3f.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_5a7d610a871a4afc90658f1b6f5b1d8a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cf.bin
73a375a6ced0fa0864f4425a039f9d4a35e126abc95477dfb2582487649ef2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 5504 bytes
font_01_sfnt_off00010778.bin
9ea5beb9bc46a7b303fb4813c479313319374db0e12c4394b443a5fd8ebb7337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 10672 bytes

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