Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f25faf5a058442…

MALICIOUS

PDF

72.7 KB Created: 2021-02-10 17:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b59a5c66f34b679f90ffecc7bebbe407 SHA-1: acd5b28ae1a12df4e88e2831032ed118f48ff197 SHA-256: 23f25faf5a058442a05ba9d690d2e9b99c5f6369340f2c3624b96895d6085bc3
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 multiple embedded URLs, with one specifically referencing 'kronos 4500 time clock setup'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links, some on disposable hosting, suggests a link farm designed to obscure the ultimate destination of the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=kronos+4500+time+clock+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371505/normal_601fcb6b7ede3.pdfIn PDF document text
    • http://gupupokuvugal.22web.org/ladiw.pdfIn PDF document text
    • http://onsideball.info/zizuvokuwikamoqgm5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5ff662bc5a2b7.pdfIn PDF document text
    • http://lnstagramverifycentre.com/alphabet_tracing_worksheets_for_preschoolr4l10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483842/normal_600414d388cfb.pdfIn PDF document text
    • http://naturaleone.space/sexubunivufajegumw4dj.pdfIn PDF document text
    • http://nilofebep.iblogger.org/lumafusion_2._0_user_guide.pdfIn PDF document text
    • http://zinabexodepo.iblogger.org/gorosamowuwolifuvawigave.pdfIn PDF document text
    • http://idealslim-ordina.site/beclometasone_dipropionate_formoterol_fumarate_and_glycopyrronium2e4t4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468534/normal_5fd083b11603e.pdfIn PDF document text
    • http://slmit.fun/unblock_ball_block_puzzle_apknh7ox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447250/normal_6002e90a2a2a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesisat.epizy.com/funny_riddles_with_answers_in_telugu.pdfIn PDF document text
    • http://lidiwerefibe.rf.gd/levorexafase.pdfIn PDF document text
    • http://vedewujesog.rf.gd/luveruvaxigesifunisodara.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/35065102459.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/free_easy_piano_sheet_music_chopsticks.pdfIn PDF document text
    • http://lokuvutifinulef.rf.gd/how_are_syncline_folds_formed.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/ajogbajesu_twins_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/9934310112.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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 5256 bytes
SHA-256: d558e98d14a57e8dbc3591dc3887385dbb984fc757f2cd9d30609cac9368ce6c
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 10888 bytes
SHA-256: 24252625568a19f7da3da49c0378aee78f21fa7bbe850bab9c59b4b7b1a5bae1

Open this report in the interactive analyzer, or submit your own file for analysis.