Malicious PDF — malware analysis report

Static analysis result for SHA-256 598ecde4b6adf8cf…

MALICIOUS

PDF

85.7 KB Created: 2021-01-22 16:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8a1f8ed79f916f16f8d6954290c11842 SHA-1: 73619dd075cf08928337b10b71299b7a86e4e945 SHA-256: 598ecde4b6adf8cf1efb490ce0e1925f66abe7387255714f566a443a4da6016d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable hosting domains, a common tactic for distributing phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs and the link farm structure suggest this document is designed to lure users 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://seumenha.ru/123?utm_term=appmgr+iii+pro+apk+uptodown PDF link annotation
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/478732.pdfIn PDF document text
    • https://sotivozorome.weebly.com/uploads/1/3/4/7/134733800/74c8808614be.pdfIn PDF document text
    • https://site-1167942.mozfiles.com/files/1167942/tijovafubebasodexabopofab.pdfIn PDF document text
    • https://site-1175775.mozfiles.com/files/1175775/wifi_driver_for_windows_10_download_64_bit.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/xiwokag.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/mavuzogamanojib_jevipi.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/14421405411.pdfIn PDF document text
    • https://walupufodurutos.weebly.com/uploads/1/3/4/7/134734499/givorokidomatezax.pdfIn PDF document text
    • https://site-1176228.mozfiles.com/files/1176228/starz_movies_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/ii8hggh/download_monster_craft_2_mod_apk.pdfIn PDF document text
    • https://miragojed.weebly.com/uploads/1/3/1/6/131637546/gexisazusure_fakowowi_pipuwetepiveli.pdfIn PDF document text
    • https://site-1176376.mozfiles.com/files/1176376/77103577293.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/VI5LWhS/usa_truck_driver_18_wheeler_mod_apk.pdfIn PDF document text
    • https://site-1179526.mozfiles.com/files/1179526/smart_scan_scanner_free_files_scanning.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/kanas-sovaromalapego-zonukukiwawix-dagujaporega.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilalixurapa.epizy.com/18222933620.pdfIn PDF document text
    • http://rugiwixet.epizy.com/vuronufifeduru.pdfIn PDF document text
    • http://lenadupubop.rf.gd/duel_of_the_fates_orchestra_sheet_music.pdfIn PDF document text
    • http://wujasulo.epizy.com/vijaxasaguma.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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 5216 bytes
SHA-256: d8d606f6e9ee28963bb1d8af2943d6676269509192b4794db8b8d6e063c7aad5
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 15912 bytes
SHA-256: 8e94cf16089b8c0669870b6528a4ab7f920cb7fc3350fc8781ef51ea8ab4b065
font_02_sfnt_off0001348c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2