Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaaca1130659ead…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 07:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4b18e0a949e92c261ce773a940f2118 SHA-1: 9dfff63acc4678e33196a56a8506945b5804eda7 SHA-256: dfaaca1130659ead65d7c0bee98eb96d53175dfdba02a8802731a80ef4600134
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://seumenha.ru/strik?utm_term=the+secret+history+of+the+mongols+english+translation PDF link annotation
    • http://creditscoreusa.info/ntr_songs_djxyz5l.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/salunjxphi.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/computer_courses_list_after_12th.pdfIn PDF document text
    • http://wersita.fun/believer_piano_sheet_music_beginnerh4svy.pdfIn PDF document text
    • http://ryukzak.digital/28690038166vgxny.pdfIn PDF document text
    • http://kvrovk.xyz/popemoparenapesuruvop6l.pdfIn PDF document text
    • http://kvrovk.xyz/262685550709juo0.pdfIn PDF document text
    • http://sparzha.club/76509539713ve19s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavapokapajemob.myartsonline.com/storytelling_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f143fbe-c367-4289-9b01-609500b8f6c6/artistic_anatomy_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf041ac-b66b-4edb-b17b-b7999d6492a3/wagotulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baeb96eb-d40c-4282-827b-f0af7cf0588a/heroes_dioses_y_semidioses_dela_mitologia_griega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc14a54-07cb-4f83-aac5-e157756eae67/build_my_life_song_download.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/muwageva.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/jazz_combo_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4675e72b-7c39-44ad-86ad-c033a4bc5eaa/rezonixegepagawekuwugo.pdfIn PDF document text
    • http://jokosen.atwebpages.com/pet_rocks_1970s_for_sale.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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 5348 bytes
SHA-256: 1e4a10be29b37f41287ef47ca9c855480a8be44d3c7ec9fd612191f7eb4394f9
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 10788 bytes
SHA-256: a9bfed2662eb43061d60307407b77fb37c88ad08adf5ae623fa7df5cf7037584

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