Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d75d936e41f107…

MALICIOUS

PDF

79.9 KB Created: 2021-06-09 10:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d9c9edbf752a6dde6f4cf61676b7ca7d SHA-1: 501b8a785594d0697cc26dffd95ee1170a8d8905 SHA-256: 09d75d936e41f107fd68b8b8087594edbff602a656c89f3edc811e98fe181831
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a piano worksheet, which is then used to redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=chord+inversions+piano+worksheet PDF link annotation
    • https://befepoli.weebly.com/uploads/1/3/4/6/134687110/xixunikap-muzijivuwikeg-jebolow.pdfIn PDF document text
    • https://ketodoligas.weebly.com/uploads/1/3/4/3/134384615/2290435.pdfIn PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/zutizem.pdfIn PDF document text
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/43d0920677c3.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/jabizilepiropedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_60450dea19530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_60669578c5236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_6041f2b1a451d.pdfIn PDF document text
    • https://fokagiwixus.weebly.com/uploads/1/3/4/6/134652182/zerusepipe.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/073a811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_600d79bf28e50.pdfIn PDF document text
    • https://jezogoxus.weebly.com/uploads/1/3/4/4/134402646/begisib.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/dakoxajipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5fe64b463aa70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144485259/new_hollywood_movies_2020_tamil_dubbed_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d47dd96-995d-40aa-b6b6-3a72d79af456/37690992743.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/how_to_charge_a_scosche_500k_micro_farad_capacitor.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144436890/benefits_of_dynamic_tension.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144532989/46294335291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17061b6-80e9-40a7-af4c-05ed08d71920/fichas_refuerzo_matematicas_6_primaria_santillana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cc1e3f-1087-42f6-8044-00c40e78b314/is_cyberpunk_2077_on_xbox_one_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c13952-4afd-4064-9667-cf3275e1fb86/what_is_the_eve_of_christmas_eve_called.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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 5136 bytes
SHA-256: 6dcfc885e0de948440e0eb3cfc3d62094702011b4acd2198f9047848eb1b7573
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 11104 bytes
SHA-256: 617dac7e986df7a4ebe77efd3aa2801088a647f30eaadf61e85fae036a4cdebe
font_02_sfnt_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12