Malicious PDF — malware analysis report

Static analysis result for SHA-256 c343632c228ecded…

MALICIOUS

PDF

90.2 KB Created: 2021-03-18 21:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8dafbe2e095e5a66a79b57d1c37ef2b SHA-1: da950b1ff06a179d467f4011a260937004ba918a SHA-256: c343632c228ecdedd4ebefaae7fbc74c325e39bad3536cd21bf7319c3f93d27f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The presence of numerous external URLs, many pointing to potentially malicious domains, indicates an attempt to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lead users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=manualidades+con+materiales+reciclados+para+el+hogar
    • http://jelusuvobirolen.mywebcommunity.org/kumiruvofubasagorerajew.pdf
    • http://uscreditcheck.info/vadagonezivikamosarrmbe5.pdf
    • https://cdn.sqhk.co/vifejoneses/ggzibYK/62422439246.pdf
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/6462744.pdf
    • http://bimoriz.getenjoyment.net/63956138471.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/69209acb90f5d8.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/ladizi_nukobi_tizavo_fopuwi.pdf
    • http://ipoteka.net/fedex_store_associate_jobsq0xgq.pdf
    • http://picsonair.com/karan_arjun_ki_film_movie7vybn.pdf
    • http://itwow.info/98485565853xtug3.pdf
    • http://sutiboju.sportsontheweb.net/mafelanuzetujujixapapaxum.pdf
    • https://cdn.sqhk.co/jasurisunav/gh3hhgj/stack_up_in_malayalam.pdf
    • http://vutunema.mypressonline.com/best_sd_card_for_zoom_h4n_pro.pdf
    • https://guwubujurod.weebly.com/uploads/1/3/1/4/131438509/9a3306b202745.pdf
    • https://cdn.sqhk.co/sozaxejiv/UiakYja/red_ball_3_volume_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/11f7b148-1e40-4d21-bf43-fc3c87f76447/dowiga.pdf
    • https://s3.amazonaws.com/dekogamik/diviga.pdf
    • https://uploads.strikinglycdn.com/files/2600e6e9-fba4-490c-994a-3ac2b1fc1c3c/24037940116.pdf
    • https://s3.amazonaws.com/kuboki/zufatexusevakunut.pdf
    • https://uploads.strikinglycdn.com/files/51814865-b64f-4992-9c0c-31f3f3df5d43/uk_skype_interview_questions_for_nurses.pdf
    • https://uploads.strikinglycdn.com/files/82d83b35-0242-4674-9ad7-3415585c298c/67125879810.pdf
    • https://uploads.strikinglycdn.com/files/da967eb6-2a06-4fec-8383-56d68d0e8e89/are_salvation_army_bell_ringers_paid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd31.bin
8961caf6acc0fe88fbaaff99fb64d36c83dd39d2d182d87ba5e29be357907970		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 5492 bytes
font_01_sfnt_off00010fbd.bin
761ebcacd387438829032c1219c0da0b575c31134e2607a2f043d3da43fa2840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 11248 bytes
font_02_sfnt_off00013675.bin
a09b4649d9158acb330b2ea0e120e75270128a26048da0cc8a43ddb7e2945503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 12352 bytes

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