Malicious PDF — malware analysis report

Static analysis result for SHA-256 978ec321dea76b26…

MALICIOUS

PDF

76.4 KB Created: 2021-05-28 21:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 32ae120f39ee72db1c579bed11e8d218 SHA-1: 5b64a2a8fe1df36bb376af3d9c42d3d334fe2d7c SHA-256: 978ec321dea76b266e506bbc5116a6d6592415ae91c2bfb76b4e5cf30d61a839
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 0.9948

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://jottigo.ru/strik?utm_term=descargar+final+fantasy+x+ps2+iso+espa%25C3%25B1ol PDF link annotation
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/8080532.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/vatujixurisenutira.pdfIn PDF document text
    • https://rerevuvin.weebly.com/uploads/1/3/4/5/134524399/5359215.pdfIn PDF document text
    • https://xajasirofoxuki.weebly.com/uploads/1/3/5/3/135330212/217ceb071602d04.pdfIn PDF document text
    • https://mebudowafiwene.weebly.com/uploads/1/3/4/6/134629245/5855731.pdfIn PDF document text
    • https://mapawoxerefer.weebly.com/uploads/1/3/4/7/134703144/bibikel.pdfIn PDF document text
    • https://duxuxivet.weebly.com/uploads/1/3/5/3/135329622/xerijoje_gugukekedu_nenonuzefe.pdfIn PDF document text
    • https://likemopulijufo.weebly.com/uploads/1/3/0/7/130739197/cd161ca5c.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/0a1d08f.pdfIn PDF document text
    • https://fifilukativoj.weebly.com/uploads/1/3/4/5/134509223/toxapadosirukiwufa.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/9e610.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/2ac9b41.pdfIn PDF document text
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/pewurifubigava.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/piwotepoz.pdfIn PDF document text
    • https://puliwavigajog.weebly.com/uploads/1/3/4/4/134469254/32b9f86.pdfIn PDF document text
    • https://dovabobu.weebly.com/uploads/1/3/5/9/135978637/revibiwesi_winuze.pdfIn PDF document text
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/kulit.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/3aff5e6772fc.pdfIn PDF document text
    • https://xabuwizadapipuw.weebly.com/uploads/1/3/4/3/134351583/migerexonegax.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://uploads.strikinglycdn.com/files/1febf687-a3eb-4e2c-b3b2-91b3f07d4998/libro_de_formacin_cvica_y_tica_2_de_secundaria_contestado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5989b69-92cd-4472-8208-a54cf22971cf/gubipezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0217624e-1971-4761-a92f-83e7c121acb5/zedumugapakapolinubemefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fa85ab-cf9e-472f-a983-8051027f1cd7/menokezova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c2e88b-8ce2-4512-9dad-e2a158ffd803/12748430940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4173be40-3867-43ff-9c73-b4c08e228768/60592278283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732fa432-58f8-4d82-b0a5-0f04f696b638/how_to_get_my_nespresso_vertuoline_out_of_descaling_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223265b8-c93f-432a-90bd-801e82436eed/76638810432.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 5484 bytes
SHA-256: b39716cd1523bc42ec84fc9bd966526f30eaabbd1958b4e9b50ce718b3836d2b
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 11196 bytes
SHA-256: 89b319865eae8dc2fbf00e0a3b2ed632870ea9ea445888a160d65823608e534d
font_02_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176