Malicious PDF — malware analysis report

Static analysis result for SHA-256 c191bd64374892d1…

MALICIOUS

PDF

82.8 KB Created: 2021-04-19 16:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 536503fce081b89a0f16620dab3b8c4e SHA-1: f21f00a92494f16ec56cb6f90efed63c30c7b780 SHA-256: c191bd64374892d1a73a21644c4f71eb4ffd498582855dc05761dc04f5ca3cd3
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 rating for a link farm and a high ML score. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to direct users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

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://dugedepap.ru/strik?utm_term=how+do+you+make+a+wooden+mallet PDF link annotation
    • http://fosonelotila.medianewsonline.com/92422938954.pdfIn PDF document text
    • http://opssmall.space/zegixe2iye1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_602edb1ae2278.pdfIn PDF document text
    • https://lowalijadu.weebly.com/uploads/1/3/4/8/134866304/76198.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/rofuseriboku_torebijufemo_tiwutosinox_dovixezilanek.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/e5963289e02b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_605f7e0472e5d.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/9085805.pdfIn PDF document text
    • http://kisizifavo.getenjoyment.net/bleeding_and_clotting_disorders.pdfIn PDF document text
    • http://aycotoro0.xyz/porozutenelafz5yba.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/05d584c0fb7.pdfIn PDF document text
    • https://lewemesabis.weebly.com/uploads/1/3/4/7/134734043/7586692.pdfIn PDF document text
    • https://wuletalevuvefam.weebly.com/uploads/1/3/1/3/131379877/vimaru_jizipalezoz_fadibuzezuputi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5febf6ea6cb2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_602e2c4a4ed3e.pdfIn PDF document text
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/5480511.pdfIn PDF document text
    • http://fexabudobix.getenjoyment.net/annex_17_10th_edition.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/83481681050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/intermittent_fasting_guide_101.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/al_quran_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/enteral_drug_administration_involves.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/bstc_answer_key_2019.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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 4916 bytes
SHA-256: f94af7ae133f762467cd7629db8148f670cb3cff79ee4113cd5c80e081560307
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10716 bytes
SHA-256: 4d53107f8b4bd78f3067fe5f87c2201561052eb1fec2650bc7e83be419c63d5f
font_02_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 16112 bytes
SHA-256: da133098c8ec00180ce5fe37c74b807b143adc5860869a2f7b6211e455203b10