Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f6d52952540529…

MALICIOUS

PDF

79.9 KB Created: 2021-03-29 00:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 979a1440846786d3c82cc20b80cdb9a9 SHA-1: 864d13e04ff44327945e195a6ed779654a7ee242 SHA-256: 83f6d52952540529857511891ccc1f74cb22fa46da096bb67be2a99ddbcac5ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://soxebez.ru/award?keyword=interview+kerja+bahasa+inggris+pdf PDF link annotation
    • https://cdn.sqhk.co/bawevabob/iibiaib/descargar_emulador_de_aplicaciones_android_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xenekifa/dVhiBB8/36673403399.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/jg3yjdm/clarinet_sheet_music_notes.pdfIn PDF document text
    • https://lefipejime.weebly.com/uploads/1/3/4/6/134668800/kijif_mujiwegek.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/e6059499b89a.pdfIn PDF document text
    • https://nazoturifebigik.weebly.com/uploads/1/3/1/6/131606271/mopadote_dogiri.pdfIn PDF document text
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/7779775.pdfIn PDF document text
    • http://pisibebix.22web.org/zusedojekotusi.pdfIn PDF document text
    • https://cdn.sqhk.co/bareziwo/E3zjdie/64927808041.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/atidhc7/fun_meme_soundboard_2020_android.pdfIn PDF document text
    • https://naxejewosusubet.weebly.com/uploads/1/3/4/7/134749601/voguras_zoxesu_zinefawuzawer_xegato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47915202-2787-4c0c-b22f-59a7ae1228f7/is_fifty_shades_darker_on_netflix_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661d621e-b3c1-4e93-bcc7-fe4a2ccd403a/how_to_put_a_kid_in_foster_care.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b859e83-2e1b-4758-82b0-e2069c17a55e/the_waverly_cardiff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148eecd0-609e-4504-bc19-1b6ecf670f31/macbeth_act_4_scene_1_study_guide_answers.pdfIn PDF document text
    • http://varijaponinaza.rf.gd/nupexopumudovezuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de13bcbc-ab47-448f-8fe0-a5b726cb57e9/nufopilasesinutojola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c1c7c2-e3b6-49ac-b4b3-62e1469eb4ac/jazitas.pdfIn PDF document text
    • http://jaliselisasi.rf.gd/how_to_improve_muscle_ups_crossfit.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_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 5640 bytes
SHA-256: 10f8431fccf692b38dfdfb2e9aa719d6a1c6ee1578a3ccdced173924154198ca
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 10232 bytes
SHA-256: f445d2ae80370c0588c4db051a481f4598caf20312ee57b4901274f2aa2904c3

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