Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a17225f95cef854…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 15:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 418a49c951c6a15afad2fb46fc985b03 SHA-1: dc79dab5e4d0652546976c567053a14c4b27e139 SHA-256: 9a17225f95cef854967e704f01c81a5ab29a6bf0eb2837d445a7a91c4019dd28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cructi.ru/uplcv?utm_term=offline+encyclopedia+for+android+apk PDF link annotation
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300ebfe05b8---58141446047.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/vijuxelomusorifewesexol.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/fopudizeruwusu.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/20986544729.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229402665f---nadobafijukufu.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/17642990606.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/xudovitoluzirobogomosube.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/notobaruviwovojimozaki.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/16445313254.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/15396354394.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/jebovavepulagugomogagunud.pdfIn PDF document text
    • http://oilspecchem.com/files/54979318871.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/duzebupimusavuv.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/9097304037.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/megozuwidusiradurukasoki.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109100037498045.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/99051986911.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/ninuwexisenupo.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/42743498862.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/53902977882.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/67799230493.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/63623218258.pdfIn PDF document text
    • https://unaizahic.com/Files/files/lejerugonadolozokikumem.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_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 10580 bytes
SHA-256: 25e0c7fe6325e6db95f12eace76be6146f6e6e51fef308bc7c30846b381a5c57
font_02_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 18424 bytes
SHA-256: c3d318bd1e5df779f97490383a45f767ca155e2887bf993b772a8ca9e550a11c

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