Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a9767524d3debb…

MALICIOUS

PDF

81.1 KB Created: 2021-03-13 19:25:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 05e783d1cb23b2940822d3a36743dfd4 SHA-1: 986c160c1b756b6d3e095431ba0b58c2b96910af SHA-256: f4a9767524d3debb3a4f563599e0bf883ae07d936849549cdb9790c6ccd6eb00
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic confirm the document's primary function is to redirect users to other sites.

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://vilenefex.ru/award?keyword=statistical+quality+control+7th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/zogobadakedu/7hgMhaL/norufeviv.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/wotibode.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/ximutunovoba.pdfIn PDF document text
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/zugekotij-pemaxitiwotun.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/4022518.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/hjvhejc/balega_hidden_comfort_socks_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/jibgiji/75599699555.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/hcGEidL/42487712189.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/bapekajip-muvivuverivig-buzalufuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/iiiehbb/13369796978.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/hbhd6QW/among_us_free_pc_download_2020._9._9.pdfIn PDF document text
    • https://xiriwedonup.weebly.com/uploads/1/3/4/2/134265341/1b01baea.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/lieANia/dash_till_puff_apk_download.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/fegemuxemeb-zegilezokepaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/lha5soY/android_system_webview_enable_not_working.pdfIn PDF document text
    • https://gexuguxibam.weebly.com/uploads/1/3/2/6/132696321/perazumataniza-fafunazutufe-kuvozimewatoge-modafavenol.pdfIn PDF document text
    • https://gamidilagadam.weebly.com/uploads/1/3/4/3/134339960/wipov-xanuviva.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/pICQhcg/viminixaruzukeniwilon.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/Y7Z5Jij/powder_game_23.pdfIn PDF document text
    • https://cdn.sqhk.co/tirinakiweda/Jgeihij/motogajodizelumulat.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/Jgjhbje/99224773428.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujokobuva.rf.gd/health_o_meter_professional_scale_lo_message.pdfIn PDF document text
    • http://savefativiluz.epizy.com/annexure_a_format_for_export.pdfIn PDF document text
    • http://bolatufor.epizy.com/82743515601.pdfIn PDF document text
    • http://bijegiritesikub.rf.gd/filubiweged.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_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 5656 bytes
SHA-256: 87603c2892135750ea9d35cdeff02a6caab54276dd3d78673c10e5b679123916
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 10860 bytes
SHA-256: b5a6d7d3e6705c6e2e424dbd9a8eada63ffe54d1979ca7ce0f5d8a3bc1024ace