Malicious PDF — malware analysis report

Static analysis result for SHA-256 74649fc5cd597977…

MALICIOUS

PDF

93.4 KB Created: 2021-03-25 20:37:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dc0dbb7003d79dfd6c89bfbdfab5d8a3 SHA-1: 20810f69530148f92c02b98bf00f2e4154fddff3 SHA-256: 74649fc5cd5979779428be370291682e58426d2aa15550bc5c225b259c227ad5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://botokaw.ru/aws?utm_term=que+compuesto+es+el+cianuro+de+hidr%25C3%25B3geno', is presented as a question about hydrogen cyanide, likely a lure. While no scripts were explicitly extracted, the PDF structure and numerous external links, some pointing to potentially malicious or spammy content, indicate a phishing or scam attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://botokaw.ru/aws?utm_term=que+compuesto+es+el+cianuro+de+hidr%25C3%25B3geno PDF link annotation
    • http://dadosib.22web.org/google_sheets_statistics_add_on.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_600d7d01ce552.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/romeo_julieta_petit_churchill_review.pdfIn PDF document text
    • http://xobigapirig.iblogger.org/healthiest_kung_fu_tea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fe91c265a338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_6056e59e82602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/649104cc-9f63-45f4-b00a-8e0d34b4165f/zudufopivowadojunuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307cda5b-f42a-4973-9eff-d31dcdaf8aa2/76135168796.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/rirumevebivor.pdfIn PDF document text
    • http://biguvuxurezuto.epizy.com/jewurixesitapizujipitened.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b917a0cc-3fa3-469a-87fc-01a1b8790955/blood_of_elves_audiobook_mp3.pdfIn PDF document text
    • http://zabuzuko.epizy.com/76795752236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaa8cbc-c2f7-44c2-9993-04aef16201a5/ergobaby_omni_360.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_f5a1b10ca79d4582925ad0d755d3fcfd.pdf?index=trueIn PDF document text
    • http://wekikoki.rf.gd/30542575126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd4fa78-b2d1-43c0-9970-98217cf71304/el_amor_en_tiempos_de_colera_pelicula_en_espaol_latino.pdfIn PDF document text
    • http://mujujilunel.epizy.com/kusevilugusol.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_0c0cf3f671c04581b291b84fc47bf10c.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_54ee364cda3a444c901ce98751782003.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_b7543ed9e7f44c4ea19a9fe7dee15071.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffa434e-029e-46d2-bbe2-27db6f1f3d46/sennheiser_rs120_manual.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_01ca37b0f9b94ff99bd3edf5e76780d0.pdf?index=trueIn PDF document text
    • http://zofekaxezujujom.rf.gd/esto_que_soy_eso_te_doy_acordes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599a81f3-c3be-4788-a9c9-f89a4036b980/gonuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea94817-68aa-48b0-bed7-7488c765f589/what_alice_forgot_movie_release.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca887177-7713-451c-8eb0-2365c852dd65/lafezakalabivekejetaw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 5684 bytes
SHA-256: 10f186992bd9c58930cd9d327616eed4573a9da2c5835eaa25c2f0cd97b9a13e
font_01_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 12772 bytes
SHA-256: 6117f96bace7fc9f65de4d8dc2c61d774d65b1c7a2a2faeed36b17d565aab669
font_02_sfnt_off00015029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15029 16104 bytes
SHA-256: d96c76f5376e419817e6c204e3c8a7f093b24231da08501056136cfbd841dade

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