Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf8d50821538b5c…

MALICIOUS

PDF

113.0 KB Created: 2021-04-08 03:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 95b679616c919c108e4b4fc1eebb0401 SHA-1: 847684bcac37a8c280503f8238558e7b524b6e25 SHA-256: ddf8d50821538b5c3cf3dbe366c6aee22919151420e739fc46cf923edf6f8057
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. It contains numerous external URLs, suggesting it is designed to redirect users to potentially harmful sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates a tactic to manipulate search engine results or distribute malware via a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=mlp+all+episodes+with+discord PDF link annotation
    • https://cdn.sqhk.co/pujazojiwixi/hahahip/what_is_dinghy_service.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/jfidhbA/63649907209.pdfIn PDF document text
    • http://olipaka.xyz/sinikujses9i.pdfIn PDF document text
    • https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/1578032.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/24378365569eds7r.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/jheDibG/house_designer_fix_flip_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/0dGMhg2/51500701158.pdfIn PDF document text
    • https://cdn.sqhk.co/jukapaba/m9iWFl4/getiviw.pdfIn PDF document text
    • http://gufutaca5.xyz/pavanuzxlhv.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/igZgfZj/my_cloud_wd_admin_login.pdfIn PDF document text
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/5212350.pdfIn PDF document text
    • https://cdn.sqhk.co/gavivevok/eHii5Mw/music_line_let_the_games_begin.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/2jjhgjc/color_ball_blast_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/hf1ihbo/41248657671.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/4285369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5ff610a3af500.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/MLmjigj/hachi_hachi_camden_ar.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/eAIjaMf/strikers_1945_plus_portable.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/c16jhZs/baby_monstera_plant_price.pdfIn PDF document text
    • http://canonsburglake.com/mainstays_l_shaped_desk_with_hutch_instructions9lwbq.pdfIn PDF document text
    • http://50offstore.info/124317830992gcrh.pdfIn PDF document text
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/7145607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_60347c7129f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/Bcheigg/19897602375.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxeje/37jbtoZ/live_concert_vr_360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.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_off00017f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1A 5256 bytes
SHA-256: 272c4360f6c50af7ead5e5dc6a2940ad710e4c5d4fc556ee386da7a3efa6cca7
font_01_sfnt_off0001910b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1910B 10952 bytes
SHA-256: 3e883f9300a244bfa6654e7b2fb89f94d4269c8bbf25dadc20017b5e8e7cd918