Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f165debda0699e…

MALICIOUS

PDF

66.7 KB Created: 2021-02-14 10:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c72ca50dc645041be1ca78dc83c9399 SHA-1: 651bbf9041ee43b0063b2787c52ed1e8ffd40ffa SHA-256: c3f165debda0699e026021fc038abfcfb5254c4336333921ab2b3d7d157f5235
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs that redirect to external websites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of multiple suspicious URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to malicious content.

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://baarspo.ru/123?utm_term=lili+marlene+lyrics+auf+deutsch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375342/normal_600a3ad76c0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601493a69eee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_60277aa551115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_60289f96938f1.pdfIn PDF document text
    • http://kasovipitafo.22web.org/bangla_movie_new_song_audio.pdfIn PDF document text
    • http://bloomwithdeanna.com/vertical_corresponding_alternate_angles_worksheet6p22a.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/bicHhfW/66093979967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5feff0910893a.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/iNjbijf/chess_offline_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/0ISuSIx/11587593563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulesovel.epizy.com/i_ll_fly_away_sheet_music_satb.pdfIn PDF document text
    • http://guxasimedoki.epizy.com/car_payment_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/business_english_topics.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_off0000c7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A8 5304 bytes
SHA-256: 89f5262e6b7e3256f85b1e9b3d95a8cad012d218486680340efcd5272c06905a
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10524 bytes
SHA-256: 95a931efded8d1db4ed15033b89efa825cb3a1130d46b2e5bbc65448f96d28e3

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