Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08d87148cfdb775…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 23:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0adcdbaca30711a8fda0db237b915c05 SHA-1: 838188eac505c1eee3054cf949ffe2193646ff71 SHA-256: d08d87148cfdb775d2abafdf228f584eae2282c9d4d490b03a42b810850b5dfa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs and a heuristic indicating a link farm on disposable hosting suggest a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 https://synerhu.ru/uplcv?utm_term=asterisk+to+text+converter+android PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29dd88e11---62737516521.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/dowipivanuku.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/tovumitumefasereme.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/12434325148.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/pabaz.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/bululoraribixide.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zixofepufuk.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/robatebax.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/naneduneduvikegoguwupo.pdfIn PDF document text
    • http://wuchem.com/upload/files/zokedesezawow.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/wijekonodokilosafubonulig.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/64399850943.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/dafowogekegupotokuv.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/bijepebuzekadin.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/rumineraxebisubiw.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/84577638006.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/faxevoledilisanot.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/11930590455.pdfIn PDF document text
    • http://cecev.com/stockages/files/29912199185.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/gananugixa.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/saninugujugume.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/matazubobugu.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 10560 bytes
SHA-256: 02d84b442056fcf6d482c7e4fb67f8991e9ec8453e34c1628060caf8e1d64502
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 18380 bytes
SHA-256: 9802a20b8c2dd0ce8b1db08b9954dac95e051e2f7a5603fb59bb41b7dfa2e06e
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.