Malicious PDF — malware analysis report

Static analysis result for SHA-256 55249a128952c5f3…

MALICIOUS

PDF

93.2 KB Created: 2021-03-25 05:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4cfd76b32c0f37853f697fcd9aa92cb7 SHA-1: 29ec118d7ef0d9fb30451bb98a6928322fa62e4e SHA-256: 55249a128952c5f3a60483f086beed4d29b64421c29e64201a969c9efebbcf13
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted software. The document body, though heavily obfuscated, contains references to software downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=puffin+browser+pro+apk+free+download+android PDF link annotation
    • https://cdn.sqhk.co/venifirub/gqifOij/menapuzurepojipag.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/51940087142.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/hKxiaOa/nidoruvowinutuzukolelod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fc75d7368a37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5ff25232e648c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_6050045d22988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5ffaaae2b032e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427093/normal_5ff1c5f72ca27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_600e874ba117e.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/hazhaU9/73048034991.pdfIn PDF document text
    • http://myluckybet.xyz/lg_cosmos_3_vn251_verizon_cell_phonerno7n.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/bca_first_semester_books_download.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/Kb2wjfw/vowezawopatebufonedibewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_602e2f2c850c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601a800b2007d.pdfIn PDF document text
    • http://goldotzyv.ru/fejuse24o3.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/m-audio_fasttrack_pro_driver_mac_os_x_download.pdfIn PDF document text
    • http://kuxixepiral.22web.org/93397910022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fc6cfd96f4a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dezinolabebosod.atwebpages.com/unreal_engine_4_fps_tutorial_c.pdfIn PDF document text
    • http://dunupilopun.epizy.com/stream_games_to_android_tv.pdfIn PDF document text
    • http://xosumuzav.epizy.com/list_of_abstract_nouns_from_verbs.pdfIn PDF document text
    • http://sotilijiminariw.rf.gd/83028727706.pdfIn PDF document text
    • http://mifawebof.epizy.com/65905162507.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 2908 bytes
SHA-256: c70e0c6391120398917ec0c474fb1184c0b56f94aeb69aa71748413518f1b619
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 5332 bytes
SHA-256: 9a02aa87562540c5c0418464c26593ab93f771e87e5ea6c5cd66564cb525f752
font_02_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 4112 bytes
SHA-256: f2383ccba2881120387e293c21636747bf72181eac5f8a822733c88b722f2d18
font_03_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 11040 bytes
SHA-256: 0b2f87f4c984126737626ba162f8bc3e8c54ebec112cf9fd5c7cb6aef496ee08
font_04_sfnt_off00014fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEE 16244 bytes
SHA-256: 2c9adacf9605f6f7030be67942ce1e21fdb5423858d5e606429c74758245d95d