Malicious PDF — malware analysis report

Static analysis result for SHA-256 7193558aa8152b7d…

MALICIOUS

PDF

75.1 KB Created: 2021-04-07 17:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f3bd5567861e10cd63b3beb3f5e92699 SHA-1: 42d0f049abc86259dabb2bdc126b68ff2f23638b SHA-256: 7193558aa8152b7dc00496526b679fec4289a9566747725da35f28c7e4da1acb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('ponafet.ru') that is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://ponafet.ru/wix?keyword=iglesias+brain+lounge PDF link annotation
    • http://bometaximom.scienceontheweb.net/black_and_decker_gh3000_spool_cap.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/zodipo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481990/normal_5feb7f5d057aa.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/tasuxozaninatal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_6050dbb5a4d04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_60081e332584b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_6031237f52366.pdfIn PDF document text
    • http://lasofetuxig.22web.org/tecnologa_de_las_centrales_termoelctricas_convencionales.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefodek/tulja_bhavani_temple_information_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c29d1d1-6887-4192-94a5-1895e4a3f9dd/97776518308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a9d95e-366f-4ba2-8415-9d7cb0745208/interview_questions_and_answers_for_teachers_in_private_schools.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/navaxobubobapaxibomanepo.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/xusuzogite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba42e2d-c978-4af9-87c8-1826e6faa565/wetazusuwefazobu.pdfIn PDF document text
    • http://zukowuneze.rf.gd/ielts_writing_task_2_sample_answer_band_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8a8307-d60a-47f3-a197-6c1cc4589f7c/toro_ss5000_hydro_oil_change.pdfIn PDF document text
    • http://fibonudonug.epizy.com/b_c_p_m_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ca4129-15e8-4177-af88-0f78510d6071/bissell_proheat_pet_upright_carpet_cleaner_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78c0bbf-467f-4d58-a7eb-4e0d74e628f7/how_much_does_a_standard_square_bale_of_hay_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2ded22-8ec2-4da6-bcb6-27439c931469/definicion_guerra_de_guerrillas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3654cfd0-c984-4090-addc-cd41fb28477f/57514489392.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/easy_stone_soup_recipe_for_classroom.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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 4932 bytes
SHA-256: f3f9a7f16c2ecad69bcd65ca123255d33b2d99f2272fac8277abb11b8295ee91
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 11280 bytes
SHA-256: 5558427e542db3e4e6ddb7d124bbd8c35843695d8a7dffb345a91316d2f8cf9f