Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23befc799b04a78…

MALICIOUS

PDF

90.6 KB Created: 2021-04-05 08:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd05d659a04acdd41c30e706ffb29d21 SHA-1: 59d19e9f2df6b6ec75ce93b5283233677311ce15 SHA-256: a23befc799b04a7832266c6e3b414fc24c0525f4f6a3d5d1d4b29a0c4f9088d1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary malicious URL identified is 'https://midufefew.ru/award?keyword=anticoagulantes+efectos+adversos+pdf', which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/award?keyword=anticoagulantes+efectos+adversos+pdf PDF link annotation
    • https://zimemomikinipex.weebly.com/uploads/1/3/5/3/135347479/3484244.pdfIn PDF document text
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/togerir.pdfIn PDF document text
    • https://rifelejoxew.weebly.com/uploads/1/3/4/3/134330737/busufuluveri.pdfIn PDF document text
    • http://richmaya.site/zadakojujalemexlbh.pdfIn PDF document text
    • http://sberbank.link/51387591335iwd00.pdfIn PDF document text
    • http://italiahot.fun/xoxodobelakariwajutilodu43sjd.pdfIn PDF document text
    • http://politach.com/cloudy_with_achance_of_meatballs_2_clip-_berry_rescuei6usa.pdfIn PDF document text
    • http://meetsucre.pro/vobewebapabaxifog7xlfe.pdfIn PDF document text
    • http://tikovg.xyz/letra_da_msica_7_years_lukas_grahame94qi.pdfIn PDF document text
    • https://potisejomi.weebly.com/uploads/1/3/6/0/136092970/limosopagunivu.pdfIn PDF document text
    • http://rineset.xyz/free_will_astrology_capricorn_2021jjkzh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_6d96ac15d9a2470daddc1bf3b2d4c72b.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_69701433687a4be3b5b2960e46df4b7f.pdf?index=trueIn PDF document text
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_1cca0667a7b04fd1b6e20ce762ee7c16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/4._3_distinguishing_among_atoms_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/84758078850.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_353612d9e73b48858129eea074249f38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/warajukotogen.pdfIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_577d8a0b36cf4565b4928605c6051bde.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_7f53b5abfe164b91bc24f107e5848a2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numunenoji/how_do_i_start_ios_app_development.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_cb952f5b4f9a4c35a63a06a72a391ce1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/vefeguviwux.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_5bb7fea778a848478ec32c7596273b64.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_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 5372 bytes
SHA-256: 7eab01499eb0d6bbf3d4617833d5478a8f8fe604da2ca3051444ce299d710ebb
font_01_sfnt_off000131d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 12684 bytes
SHA-256: 7b2bd906e9d1d53a9faa9da31262da4446d7c24a65a60880a5f675d83ad064ab

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