Malicious PDF — malware analysis report

Static analysis result for SHA-256 934668dde9427c19…

MALICIOUS

PDF

75.0 KB Created: 2021-04-18 00:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 484abea6985be256a60e4c0b6bd66baa SHA-1: bc3c747616ad816da925665b28346d22bc7a1b8d SHA-256: 934668dde9427c190533170aa7bf08d289c2a53bf79af9f7b99d960436379a58
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing lures. The embedded URLs suggest an attempt to redirect users to potentially harmful content or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=classroom+management+lesson+plan+pdf PDF link annotation
    • http://botanilix.mygamesonline.org/zoology_practical.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/gihagjz/15142161415.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/XhaK4XU/4755035754.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/dd_campaign_setting_books.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/NjbcigP/little_dragon_heroes_world_sim_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/jcVjiz8/happy_birthday_brother_sms.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/cwHkEjd/yellow_light_on_iphone_11.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/benedetti_poemas_de_otros.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/caracteristicas_fisicas_y_psicologicas_del_adulto_mayor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_22dee41b2e0743e6ae69556d5e258d7e.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_96a391211f2b4c43923db1791ec7a9ed.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_d4f29d4b40914bd7b98a34381e349057.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_0aebaadfa9a14b96b366ec7f8100a633.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/bramman_movie_video_songs.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/ponez.pdfIn PDF document text
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_c2d40e6a486f44899a44ff0a3f574b49.pdf?index=trueIn PDF document text
    • http://gowepuxajotezo.onlinewebshop.net/latuzuxinajegemajapo.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_3003a6ecdd684018988de82807b8dae9.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_04e1b5d914d046219f3b91c8ae8b4286.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_38bfebab305d443ab0f6a5181fd36257.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/27831219241.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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5268 bytes
SHA-256: e8dfa8f4444f37149d3960c575df6e67a1c0b642ab67906d7c705a1f1a76c3f2
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10396 bytes
SHA-256: 820bec1cd8ec0b3b8d09978ec0235c5c77eb64deb0f15a1ca4f797d280a73bb3