Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3e272fab086eb6…

MALICIOUS

PDF

108.0 KB Created: 2021-03-29 11:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 488beb4e48ccff16916a8afa790da8b3 SHA-1: 23ee5ac619b2802d7a17080d140675030e879e1d SHA-256: fd3e272fab086eb6ac25c5bcaff8f9aff169258a3b7b0ac9c57de01b33f943bd
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. This indicates a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+an+example+of+a+transformational+leader In PDF document text
    • https://cdn.sqhk.co/budajawisore/wFkjazm/flight_pilot_simulator_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jidobimatu/dih9gcl/25816924514.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/t7aihYX/fuvosesefunowubeba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_60052fc913dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_605a67ea4ac0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_601c9c78535c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_601e0478efe5e.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_604fbc13cf519.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/fS55jj0/alucard_best_build_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6018b479b6754.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447906/normal_5ff4704bb42d4.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/sbi_internet_banking_apply_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_0748dd7145114d4d9d15db669e75a819.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2aabb2-181b-4c86-be1b-1ae280ed001e/bajar_musica_mp3_gratis_para_celular_samsung.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_3f64576573834c2b8e3780825b24b5bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13790a2e-36eb-444e-a3ff-dd309f733704/33424524035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47ca2c7-2cb8-4e11-912d-6a40f51302a6/us_history_chapter_19_section_4_guided_reading_answers.pdfIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_54ed662af3f2463b80c79324e1267faa.pdf?index=trueIn PDF document text
    • http://simarifanudus.epizy.com/fawagetisaferolowo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BE 5152 bytes
SHA-256: a9c107c8bf1cf289d13aff383cfe7a9b3f19856854f7fb90fe62db1e42a7d26d
font_01_sfnt_off00015819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15819 11608 bytes
SHA-256: 899f1e408f88f970b7b11566ed439311049ed43e4a514912919807706b0f3b31
font_02_sfnt_off00017f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3E 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d
font_03_sfnt_off000193d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71