Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e4473d25f42553…

MALICIOUS

PDF

76.2 KB Created: 2021-06-06 04:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dc7fb048fbd5daef82880926f94f18f6 SHA-1: 69747bc32a4803763bd447f0fdf957d8e5995a43 SHA-256: 00e4473d25f42553dd3e4e81ecc449adc6f88ac80664e399e40f9debb45323d6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=aetiology+of+down+syndrome+pdf PDF link annotation
    • https://wuzajamepoxomis.weebly.com/uploads/1/3/4/0/134096323/jejedimitewodi_tikipivizotag_jopijamulubemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_6002b2b02ae47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5fda28ace6f55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5fe3c8e298244.pdfIn PDF document text
    • https://vitekola.weebly.com/uploads/1/3/4/4/134461908/tigofivit.pdfIn PDF document text
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/wawogalonodajep-tored-rolozajizuv-tuwalufasum.pdfIn PDF document text
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/zaduwupuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_6066e18b591c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_605328997267e.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/liwakufoxasotusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_6045ba3359655.pdfIn PDF document text
    • https://vufegolafo.weebly.com/uploads/1/3/0/9/130969987/lutuzuzujililewimo.pdfIn PDF document text
    • https://roguzemu.weebly.com/uploads/1/3/6/0/136018034/89ac4e226273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_6015cbf070afb.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/3928827.pdfIn PDF document text
    • https://tugarekuxu.weebly.com/uploads/1/3/4/3/134307697/vojos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_5fe8b46c20d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5fdf64732adcb.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/c7538f9c-2ee6-4568-9ed3-aaab8b49e4cc/personajes_secundarios_del_coronel_no_tiene_quien_le_escriba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96d4901-c0a3-4f00-907f-8e253798c37d/77835107880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577e4563-2f30-44c6-be69-8f7733b60a55/nebewibimixadewobox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95af6fe7-e4ce-49d3-bb6c-5feb93867395/nejevifemerotaxubidemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3848fa8-511d-4500-98e7-d6f70f2dce90/neseduz.pdfIn PDF document text
    • https://medlineplus.gov/downsyndrome.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 5336 bytes
SHA-256: 63fb039a0c437a050ada6661afa1da1b66b411a053e9bd8a47f6313a9b0b0dd9
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 10560 bytes
SHA-256: c9a1ca7e279cd61e8a55b9ca0f2779083051b994049d1c70bc8ad970ade04d9c