Malicious PDF — malware analysis report

Static analysis result for SHA-256 7850e8aedf57b506…

MALICIOUS

PDF

74.4 KB Created: 2021-03-11 09:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e733ec5a3bee9ba06834e37e5bcbdc38 SHA-1: bf91fd5b95a154f6e29169fcaaa193cd79377b69 SHA-256: 7850e8aedf57b50686fb24c8acb1b15ae47c107757422b26702dde49f5231afa
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous external URLs, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment, pointing towards a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://botokaw.ru/123?utm_term=kya+baat+hai+full+screen+status
    • https://static.s123-cdn-static.com/uploads/4459483/normal_5fff9d90add65.pdf
    • https://static.s123-cdn-static.com/uploads/4374979/normal_6002eb2657cab.pdf
    • https://cdn-cms.f-static.net/uploads/4374521/normal_6018a32293e4c.pdf
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/fosiwo.pdf
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/lifekoxetowi_supapopo.pdf
    • https://cdn.sqhk.co/vetukalujir/jeMjagd/my_landmark_employee_login.pdf
    • https://cdn.sqhk.co/penazavoxu/iqThdhB/best_photoshop_app_for_windows_7.pdf
    • https://cdn-cms.f-static.net/uploads/4372707/normal_600bd91aa8c67.pdf
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/9d80fda70e979b.pdf
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/2549949bb.pdf
    • https://cdn-cms.f-static.net/uploads/4366055/normal_602b2a3d7ce6e.pdf
    • https://cdn.sqhk.co/pubamegumox/ilqTggh/lesson_plans_for_freedom_riding.pdf
    • https://cdn.sqhk.co/totimujid/vjite3a/tubemine_free_coins.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_bbf0b1e89b5243f2a3415427369b02a9.pdf?index=true
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_f05f046fc9b84dbcbab2dfb921991689.pdf?index=true
    • https://s3.amazonaws.com/jupudizadid/xuvek.pdf
    • https://s3.amazonaws.com/tiduro/14599421599.pdf
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_9dcd4774653143cfaae5e72901333e5f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd17.bin
82a51055f66e66951f2e160d85ad8909343f651415a9a04231181942c84ba689		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 5180 bytes
font_01_sfnt_off0000deb9.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 2140 bytes
font_02_sfnt_off0000e890.bin
9a18b24e533fb69244af9153544a86f0a4f29d919587fedce9e4d47397d07fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 9756 bytes
font_03_sfnt_off00010a3b.bin
e280d6467c9953a72d7138fdc2b5e7fb3d993ebe427294dd0c04e1c9dbeb77b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 4260 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.