Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7466db84f74b705…

MALICIOUS

PDF

80.3 KB Created: 2021-03-29 05:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 29c9a8768c80cf6f470c3b5f3e1328f2 SHA-1: d47de94362e86dfa3220f35a637f92dc249f0308 SHA-256: f7466db84f74b705520684ec49af50ea9388599f0af4066f68b02e1f1c35cd1c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=ceremonial+adjective+form PDF link annotation
    • https://vusujotogeza.weebly.com/uploads/1/3/4/6/134653296/lilomizirol.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/kopewebikuxubonubaded9yhe7.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/2bc5473413.pdfIn PDF document text
    • http://momentikshop.space/cheap_pocket_knives_near_mewvcj8.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/0dbcbb9e-56b3-410c-aa48-50ee01ff6f81/mijape.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_fb1ceec17ddf4f0d909b134546ff85a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ca5936-1f36-4ad6-92ed-dbecd853d5c2/wagewavoxelazaviwukak.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_0da4e512ac9244f7aea7e6240015f766.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bea799e-0694-4d1b-b678-49dae00ec322/social_learning_theory_bandura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1a1601-2ffa-43ba-b558-b616ba17014e/godixomalexunow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3274dcfd-8a34-4402-95be-e5dadba37509/zamuzufojixalupumitube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9d69a6-6383-42b2-94cf-f0b2c51559ad/jomorokusifikijija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b83539-d1f6-481e-8d17-b281bdb153bb/5550374616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fa7cdb-9460-4099-bb7d-7ef5f8577e72/lg_mini_split_troubleshooting_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20656a5-7eda-4d0c-88c9-65721384e4a1/32171256532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3846a3-989c-4bac-a365-71468cd45705/sikujenekabeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9c3ff1-4d87-4229-ab4f-84b371a77ade/paveluxudika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51da2937-806a-40c9-bf0b-b8dcd748c7db/dezojedekanonisaviro.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_b615cabadb4c490aa5de3f5e5a855463.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_6fe63eaabebb47d1b175c43b5d035896.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
    • 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_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 5032 bytes
SHA-256: 83b5febbee89c029331aa34f61acaa62670a32b1135a914f7129db17a3b132f3
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 12604 bytes
SHA-256: d435a6189a7c2ae1482c8d1088740698070287d1ce31fc4176fac9f53e7fe89d
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 16060 bytes
SHA-256: 4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216