Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3c681cd0ab7cd1…

MALICIOUS

PDF

68.3 KB Created: 2021-09-11 23:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 724ea8c0fd720695e5ad6a3b17479f42 SHA-1: 0ab9bd0e2ed256605f0cd99694239f787917bf64 SHA-256: eb3c681cd0ab7cd148c75eafe925d117e9930c8cae21df3666f638e4ae809ccb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface with a click-outward action, typical for directing users to malicious URLs. The presence of numerous embedded URLs, including one pointing to 'synerhu.ru', suggests an attempt to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 68 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://synerhu.ru/uplcv?utm_term=best+free+online+sports+streaming+sites PDF link annotation
    • http://dsagco.com/Upload/file/xadulufemuwovumifa.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/kegokowamurizixubenobet.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/mukofibowekiramivuvu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613673840f5a9---bobasozeditovusi.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210908_131608.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/duridepijumenote.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/81432657820.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/34060447141.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/josotesilejuga.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zofepadovobozaziwunuwir.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/39757886186.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/tugugesavodezakut.pdfIn PDF document text
    • http://pk.mo/userfiles/file/41179068037.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/27254516578.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/86qeb4gmbpjeog866r72hu0e75/nejejegopusajipeti.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/sewebuxuz.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/59814185425.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/84000168.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/luwitezomopugifojatudu.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_52AADCA3A535ED2B.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/wufugiz.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/sokogavepez.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/14388635171.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_off0000b0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B8 13828 bytes
SHA-256: fd1ad243bc6ef050c56bd7048821274d8ea4447ceceff2c531110a15257d8f6b
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10756 bytes
SHA-256: c707041b8664ad931415d6a8eeb40c4c5ca23f62a0699fcd425f0505c3aa1478