Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9c72ec674ec7b1…

MALICIOUS

PDF

115.4 KB Created: 2021-03-31 03:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0b45faee6c847f3683ec02b1fb0e7e6d SHA-1: d5db8de57c47766bc1ad0be06aeb82fd7895b7ad SHA-256: 3f9c72ec674ec7b1b33a110efed9f7041f545ba775e816189c001cabf4e96102
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs point towards a phishing or SEO-based malicious content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://maypoin.ru/award?keyword=armchair+economist+pdf+download PDF link annotation
    • http://fijubigatusurov.scienceontheweb.net/reparuzelosojidixomedela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495037/normal_5ffa80f408283.pdfIn PDF document text
    • http://ses-paypal.com/craftsman_6.75_lawn_mower_oil_changem941e.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/zakitedu.pdfIn PDF document text
    • http://nowtorrentz.com/juwenisagokugiboluluxrtj7e.pdfIn PDF document text
    • http://kusukeluwabe.mywebcommunity.org/python_programming_for_beginners_book.pdfIn PDF document text
    • http://usacreditreport.info/lista_de_verbos_irregulares_en_ingles_agrupados5py6p.pdfIn PDF document text
    • http://lavka-karamel.ru/yoga_sequence_beginners_youtubex6eg5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_60142272f0d33.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/gutizudikixulugak.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/el_significado_de_las_artes_visuales.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5fcc3c49c774e.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/toyota_camry_2020_white_pearl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fd3a339471f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/87363678967.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_8ddb8ed9fb0c4ff1969f15f2ce885051.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/what_happens_when_you_exercise_for_30_minutes.pdfIn PDF document text
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_4047833ec4854e75a9560521b06edafe.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_622a913bcd9344d68cd95a5aaaa14a36.pdf?index=trueIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_2b5d200bcd3a4f09a2740eb2a40869bd.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_63f0c05483464517b17279a7838db4ad.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_73c43b1813284ccdb08aa8b1a4195cff.pdf?index=trueIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_d303297363364e04bc06ea3b1620557f.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_6170bd1dd6de42c7b0566a54ffb97aa4.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_284375530f81425da9377aa9771ef72c.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_04069f07b48c4309a93d4e8f1ea6334d.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_off0001865f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1865F 5476 bytes
SHA-256: 0ec32ea43e2aefeb9b361b09df9f39e29cf1e71ba6daa99bc66c821ea6713a93
font_01_sfnt_off000198e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E8 11340 bytes
SHA-256: 68d541091b294cf13e150837fca549a4ea1d119119e0c8577c8f438fbf1be8b9