Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59ded0426168a10…

MALICIOUS

PDF

71.6 KB Created: 2021-06-11 05:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9544318e57fee12c684635a1652581de SHA-1: 6c943d8481cf971933c412fc1f19a7f047e4b954 SHA-256: f59ded0426168a10df7e0af645ce8d6a4cb7138d8046468080a5386908c3d8bb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/pbw?utm_term=dexter+season+5+subtitles PDF link annotation
    • https://duduzigofusu.weebly.com/uploads/1/3/2/8/132815892/d7f39.pdfIn PDF document text
    • https://wudopivuvev.weebly.com/uploads/1/3/4/7/134752163/fizilidota.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/zoxebima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_600c73d8a0f7e.pdfIn PDF document text
    • https://gikapizuwixa.weebly.com/uploads/1/3/4/0/134097763/fdc749d6e09.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/fexamopisigi.pdfIn PDF document text
    • https://begiruxuvasepi.weebly.com/uploads/1/3/5/3/135351124/d1f8ad8d5451a1b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488815/normal_60b04643228a3.pdfIn PDF document text
    • https://pisiteju.weebly.com/uploads/1/3/5/3/135314571/jubew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_6037a06f4d098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_6014ba577384e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd7b4f3d188b.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/3247196.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/678aa.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/8430779.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekokos.pbworks.com/f/68159437058.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/how_does_dynamometer_work.pdfIn PDF document text
    • http://nixefijevumu.pbworks.com/f/62062260487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/facc97e6-8944-4ce8-8d83-edd1404c4b62/game_of_thrones_book_hardcover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faaf928f-0977-4a44-9c68-264d6e17191f/english_speaking_learning_videos_free_download.pdfIn PDF document text
    • http://gutogupaxaz.pbworks.com/f/47332711482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c13247-8293-4a4c-9bb0-2a91cabc0bca/natepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c813bc-48d4-434a-9d52-b80c8887c352/what_does_a_career_in_data_science_look_like.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/btec_national_health_and_social_care_revision_guide.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144428685/which_chromebook_is_the_best.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413991/set_up_google_home_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a708899-c740-4b80-b654-cd60372bf23d/metefu.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/foscam_fi9831p_v2_reset.pdfIn PDF document text
    • http://fuvuxagola.pbworks.com/w/file/fetch/145090905/kexef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 5008 bytes
SHA-256: 97957262b0177f915eba0704a5466ddf02dc8d91709aa31095c1c1c990fa2c6e
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 10996 bytes
SHA-256: 27bca0e03c53e713202ed445519fe9d94646d99fe9e20fdfb94440006ef1d76a

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