Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0b4a0f6d21005d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 07:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7030db64d25ce33509445cd7468e8cde SHA-1: 0351f473209fbf03a244a03712646ca10d2afc08 SHA-256: da0b4a0f6d21005d989538eb31bd2db1dcdb265a86366636cdde888255abc33a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=redmi+note+9s+in+sri+lanka PDF link annotation
    • https://serihosting.com/calisma2/files/uploads/72226486801.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/mojebevibejoxukigu.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/29141683314.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/kuwegexupoxemab.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/vutuworulovimu.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/8430328109.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sodilekalomaleta.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/majuxesuwefakujotajivu.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///metirutaguruniluzet.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/26154801265.pdfIn PDF document text
    • http://acril.ru/ufiles/files/sosel.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/39734406799.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1615213238cbf2---67095572848.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/vexefevezazapeto.pdfIn PDF document text
    • https://photofetimages.com/savilum.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/rejosamutelez.pdfIn PDF document text
    • http://safarang.com/basefile/files/tonegizijojisef.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210908210151.pdfIn PDF document text
    • http://identik.hu/editor_up/78997845218.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/lezajikojagamajesek.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/31779648554.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/gutuwasope.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/jeruzukomirilewa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD88 15364 bytes
SHA-256: a5f60c096781b6b2ec4a60b29947bfc151d029ac3b39c9adcb3c00e73968b50b
font_01_sfnt_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 10716 bytes
SHA-256: aa41d44cff04032cd828338df1f958631fbe07df90022fe24b7f6b4f7a3182b9

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