Malicious PDF — malware analysis report

Static analysis result for SHA-256 7411d1353647a0c8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 10:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 774809963e56ea8583344e81135d6f29 SHA-1: 7a9fb70a939adad6e5011ef1913acc5269e80284 SHA-256: 7411d1353647a0c85451bf13669799c20cb27facf1db480f7ae162a00caa3b58
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Security software disable instruction' heuristic suggests the document attempts to trick the user into lowering their defenses. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely involving a secondary payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/45124174704.pdf In PDF document text
    • http://cke.hk/userfiles/wipufazomejaxamarujikozib.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109170407188269.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/62328051635.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/paxovixi.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_115403.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/benek.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/67200694765.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317821d0dc2---bagurovefiraz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ahldk4nfgrmo995poof67g36p7/52891165251.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/puvirumuwular.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/72179030934.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/bunenela.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/83262217147.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sekijavanokor.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/81975473786.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/pevobixavalezoborapurosi.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/52722181840.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/gimudaleg.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/pejelow.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/vuruzuf.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210912_212912.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/77546352968.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/68054737648.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/polose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+naruto+shippuden+ultimate+ninja+storm+3+androidPDF link annotation
    • 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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 11148 bytes
SHA-256: a3cf20de7657f360a7182269cc2f9527b006bc309abe7e36b77b6bd070a76b53
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 19008 bytes
SHA-256: 5df5c035380161a39b80d3793d047de996e5ce6de4dedc17a66ff127a672e149
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1