Malicious PDF — malware analysis report

Static analysis result for SHA-256 4587e306c5349a4b…

MALICIOUS

PDF

79.1 KB Created: 2021-06-11 11:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6ca5cc8275b59c8841adc822c343b1c4 SHA-1: 3f2220a283062c11808cd8c56dbd329447b9d991 SHA-256: 4587e306c5349a4b0f8d820c0a33fe84ddbf1455546cf5eba08178c74d51a900
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external PDF files hosted on various domains, likely as a method to distribute phishing content or other malware. The presence of external URIs and a link farm heuristic strongly suggests this PDF is part of a larger campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=architectural+floor+plan+presentation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384470/normal_6046c75078b3d.pdfIn PDF document text
    • https://lenoloxib.weebly.com/uploads/1/3/4/0/134040664/b80a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_6044752001ac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_6008089af0611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_6012c30343cab.pdfIn PDF document text
    • https://ribebofav.weebly.com/uploads/1/3/2/6/132681502/funuv.pdfIn PDF document text
    • https://rogiguzuma.weebly.com/uploads/1/3/1/4/131438844/gafadunif-rafuz-talukevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_60bff9294f1ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_60596a317b75e.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/e49ab4f3-9c9b-437f-b725-a0474a1a0a64/ps3_controller_amazon.ca.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/theory_and_practice_of_counseling_and_psychotherapy_9th_edition_test_bank_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1cb745-c38e-4b4b-84ad-3a9e5c19870c/91887583015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f6297b-a162-4b7d-a232-042f27588249/does_fl_studio_mobile_have_plugins.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/xulelewinunekinavolosukej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f00d4d-fe84-4446-92d0-036e9164f49e/how_to_measure_gdp_per_capita.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144428727/xesunojumimunasetuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c41e12f2-00ba-40a0-ac01-cfb3258b7b74/adjetivos_comparativos_y_superlativos_en_ingles_lista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5126e2db-90c7-4fa4-9532-75d556fb298b/problems_in_african_history_robert_collins.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 5092 bytes
SHA-256: 444dad75fa641aa875fa6525a1bf5c8b060715f2e05a4b91673e3549a1bc16ee
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 10664 bytes
SHA-256: a0ade5342c17b94f00ed9d05975f470e9423eabad08775de0dd59aff3a1e1719