Malicious PDF — malware analysis report

Static analysis result for SHA-256 56030935f13eb239…

MALICIOUS

PDF

77.9 KB Created: 2021-06-02 07:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: da136b2d57a46016c3da98c1eebbea32 SHA-1: f1300fdf762fa2f929d1987c772420ce1f00603d SHA-256: 56030935f13eb239324a47c1e3260873a94d556c78d334f8c53c16dd7773faa8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/pbw?utm_term=traveling+parallel+lines+worksheet+answers PDF link annotation
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/jefozuxekepi.pdfIn PDF document text
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/zumesi-xovekudizeviv-dofebudurub.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/resosebasalalezu.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/rufazu_vaxaf_fujoberibewu_lawaraduwolese.pdfIn PDF document text
    • https://biruvosuvibu.weebly.com/uploads/1/3/0/7/130739381/vijexefonene.pdfIn PDF document text
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/3165852.pdfIn PDF document text
    • https://sujuwamor.weebly.com/uploads/1/3/4/7/134719544/e04f3c1895ebf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovojigu.pbworks.com/f/33215753141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5dd0cb1-142b-4727-bee5-4e2ed811c415/alienware_keyboard_backlight_not_working.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/how_often_do_you_take_docusate_sodium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbf4cb1-f146-474c-9ea2-38c963bd4a9a/27280255994.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144415356/nolajakajifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e19784b-e006-4187-870d-66f656977856/braun_triumph_professional_care_9000_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b05756-448c-46ef-810e-a21e2c1e92c3/cch_xa_ti_khon_google_khi_in_thoi_xiaomi.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/amazon_flex_apk_download_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9fba13-ee4b-437a-add4-6576c8225bcb/hp_deskjet_2512_price.pdfIn PDF document text
    • http://wisarazed.pbworks.com/f/59471122063.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/vertige_de_lamour_guitare_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18235ca3-cbe9-4547-86d8-3e662e34debe/notes_from_underground_quotes_free_will.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144423987/albert_camus_veba_zeti.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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 5248 bytes
SHA-256: 0ecf4c1e7db3e41a574c924f9ca4745e8afa25889d5f33952967566b7efb18e9
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 11448 bytes
SHA-256: a2e4aa3ff3a991183075ae9ba811564983249c74071d01714eb472b1167b331c
font_02_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2