Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4f49167c1c92e7…

MALICIOUS

PDF

74.5 KB Created: 2021-09-27 07:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57335303ed518ccee9bad310b9df1586 SHA-1: bf588d9c68213d7100081d35cd6c9c4bd6505be0 SHA-256: db4f49167c1c92e7a76a75a14579a5627e97a78d756274baae47b95d3a926a27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest the document is designed to direct users to potentially harmful external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection points towards a phishing or malware distribution scheme.

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://crysiq.ru/uplcv?utm_term=ace+attorney+trilogy+apk+download PDF link annotation
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/72634255263.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e7e0cea3dcd53ac12431cd38fa7c8988/93727485517.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/mafem.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/20431965628.pdfIn PDF document text
    • https://liguecasa.mmsfoot.com/stock/file/16839365012.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/99339869742.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/zibugibofigemezona.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/lelepupenapagalisoziga.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/xepazekilizagogabare.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wejubozagaxafareralapafov.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/96804520644.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/90958592223.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/196281447.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-16/20210916194808565442.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/28274375688.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/vodake.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/gawezusa.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/21403989313.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/vinetanidogidixorotele.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bcfc3c3f---97201072907.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/50294438498.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/giwadaw.pdfIn PDF document text
    • https://leeleather.net/userfiles/file/75780549241.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_off0000b83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83E 19548 bytes
SHA-256: 4eaef2d60ef903d87e3b678e0703af74849075ca59a3dde34aec124e9fdbe168
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10796 bytes
SHA-256: d75b51fa92bb7424cf898cbea9833d4afe5bb9ad63097efdc94f7cdd7ebf31d0
font_02_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1