Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdba256dd434924…

MALICIOUS

PDF

76.4 KB Created: 2021-01-26 03:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9f25f8d263d75fcea50283026c313796 SHA-1: 2e0b5aca902650ee44b7e63495349baaab71e0c2 SHA-256: 4bdba256dd434924a62a8bba4fe8fbe58330ba7502510bfc2e8a30175bfa88af
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of a known malicious redirector URL further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or content-distribution scheme.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/infin?keyword=brockhampton+merch+size+guide In PDF document text
    • https://cdn.sqhk.co/madagijoj/MjgDjUg/match_attax_champions_league_2018_19.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/iHhEhbb/wivuk.pdfIn PDF document text
    • http://gallery-shop.site/best_ps1_emulator_for_windows_103jqvc.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/8033715.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/5922500.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/gusaneloxoj.pdfIn PDF document text
    • https://sujosajuzatitoz.weebly.com/uploads/1/3/5/3/135312362/bilisemegevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fe05c5e3054a.pdfIn PDF document text
    • https://cdn.sqhk.co/taxuvoguraji/yji64tm/gevag.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/zicbghn/kodiak_bear_hunt.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/T6UbWKm/1599378468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5ff45de7119e0.pdfIn PDF document text
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/fuxonexilijiwudopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sitasuwa.epizy.com/adblock_plus_chrome_android_extension.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/coldplay_the_scientist_piano_sheet_music.pdfIn PDF document text
    • http://doxekapop.rf.gd/75281339153.pdfIn PDF document text
    • http://ponuruv.rf.gd/derenuzolof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 5500 bytes
SHA-256: 82a1ae837a44066b3e8a2baea75d2ead760715e9ffbcc90ce7ef956421622819
font_01_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 10912 bytes
SHA-256: ea6b6d81961c58b25e6de1e8366348b1f2ea583f51f741f550090be45f94970c
font_02_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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