Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cf179f388539e7…

MALICIOUS

PDF

78.5 KB Created: 2021-05-23 04:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ac8e2a592de4401bb083cf42789d1760 SHA-1: 674cf0e2733a65e24a862249112766eb218b3160 SHA-256: 23cf179f388539e75fcfd157e3ca72681b1d98662dc7a4cc8d642f6973de9589
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent URL, 'https://xezojetit.ru/strik?utm_term=why+does+my+jbl+keep+cutting+out', is identified as an SEO redirector, likely leading to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/strik?utm_term=why+does+my+jbl+keep+cutting+out PDF link annotation
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/nutejiwede.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/6383169.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/2475202.pdfIn PDF document text
    • https://febasenijig.weebly.com/uploads/1/3/1/3/131379808/gaduxixaketafu-rejom-zebexeseza-golotopaxoxado.pdfIn PDF document text
    • https://katexiru.weebly.com/uploads/1/3/4/5/134576370/zuwexazekepokuk-losuwovu-tojum-dasomeb.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/gejonodu_webumolunesol_nezumalagile_mapisis.pdfIn PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/16ca8b4c1060b8c.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/binuzimoguf_bokimivajizeb_xinova.pdfIn PDF document text
    • https://mogekalama.weebly.com/uploads/1/3/4/7/134741787/8a754088e98bab.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/8869405.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/zuwikinuseror-zofivijixojele-rexodetusufefo.pdfIn PDF document text
    • https://dosidebeg.weebly.com/uploads/1/3/5/3/135318632/8300428.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/4611062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezutu/44984300530.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/jagamanta_kutumbam_naadi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/the_uses_of_enchantment_bruno_bettelheim_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/sales_interview_questions_and_answers_for_freshers_quora.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/6720292047.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/93951542650.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/robbery_bob_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/xavolebajeka.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/free_online_bollywood_movies_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/maths_fractions_worksheets_for_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/cleeve_park_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/witewev.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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 5576 bytes
SHA-256: 9bda858436da2442bf83d1983c174005e88b4fd1812d9186dcb03e38a1ae33af
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 10592 bytes
SHA-256: 607cf2295270227b0a5b5fca85a2d7218c29724672b4ac5ae3049b8dd5e0fc22