Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3bd579eba33e6c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 14:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acc29d8ff48809364d7fdcf51aa74871 SHA-1: 739970812d7b913d2beaf61079606826e7f03cee SHA-256: ff3bd579eba33e6ca1436e3dbe659170f8d6354ee7543c1a4dafa7bf99e7ea78
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is detected as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains an image-based design with a clickable action, directing users to external URLs. The presence of numerous embedded URLs suggests a link farm or redirection mechanism, likely intended to lead victims to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=bhadrambhadra+gujarati+book+pdf PDF link annotation
    • https://optimustelecoms.com/ckfinder/userfiles/files/xudevikufunifugavujoxituf.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/98465003719.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/kujefeba.pdfIn PDF document text
    • http://eternoohydro.com/d/files/xobujapevi.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/zutotegutizasuvala.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/53809506019.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/69900847177.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e4b8415df19cf9c390ba86757cbed842/vupokobuxavejibowo.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/nupadazitusel.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091104001073499.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/36493222269.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/pomekovevuraru.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/87020832676.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/58283050172.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/dojuluzebufinumumeker.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/30967762730.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/wusimodi.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/9530197999.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/kiteg.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/dekubabasibokixe.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/44446090764.pdfIn PDF document text
    • https://ijp2.com/contents/files/geravulajilepalivenuguw.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/71535642386.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/woxamezevuxavag.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/65988027345.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/69236438988.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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 11012 bytes
SHA-256: 79c1384dfabde533527c3ff7a8d992c7aec1ab472a702c2bbf40a18ec9b57736
font_02_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 14284 bytes
SHA-256: 238509f96cebc22cc697673d088ca12160985b2761d4c212b598ee30046b0a45