Malicious PDF — malware analysis report

Static analysis result for SHA-256 b246c78bc388470a…

MALICIOUS

PDF

102.2 KB Created: 2021-09-24 06:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 01b1129544d4857585f10a368763879a SHA-1: ba5b679b54ac380430920782dd40059b380b0c51 SHA-256: b246c78bc388470a3eb22d85fb871d5d52fb912b465206efbcfeda8b9e346cc5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs, many pointing to disposable hosting, strongly suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=pokemon+sun+download+nds PDF link annotation
    • http://risme.vn/files/2152776005.pdfIn PDF document text
    • https://upaspor.com/resimler/files/segekawavunukul.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/15613790273.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kumiwazepit.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/12439619184.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/wifodofikuzedibi.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/wetigofafanazibejak.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/duwidusiw.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140394c996b3---39556595058.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/lolunifetizazozoxod.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/nofowodejexigipep.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140790f50df5---12945022490.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nawib.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/fasazufegeduzu.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/73077908641.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109161213278914.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/tovotesokumajabazoginusem.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/35437573166.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210922195845138.pdfIn PDF document text
    • https://cartolmania.it/file/57033770180.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fepav.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/15/xutojudanitifolubuge.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/ledavuxigujaf.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/6124796068.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_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 20060 bytes
SHA-256: 26e546e9c35912f85d38cfe4bdcf0b3883eb733c46b2245cef16d81eb4b27653
font_02_sfnt_off0001737f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1737F 10400 bytes
SHA-256: f2ee7a3ac9189feddcd46f17346e626c7147c938b98d21112bbd938bb7fae919