Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fb87b1d66ccae1…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 15:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c52fc5beb03373b647bdd6931d2f42d3 SHA-1: 4356fbd53c7fe50deb3c16b81f42a16447d8b3d6 SHA-256: 24fb87b1d66ccae1baccf33021bfff556b3e3ed38998794e721796f0e193078f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed as a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=open+bak+file+android PDF link annotation
    • http://kepco-group.com/uploaded_files/userfiles/files/puvirumuwular.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c9c4e000---wetolopipizonobawafix.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/53859748287.pdfIn PDF document text
    • https://linker.tw/files/foperim.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/12750255015.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/zisasex.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/zodewa.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wemosisuxiditokanokolukex.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/30886333537.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/95629793914.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/72213704052.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/57714541059.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/93794576308.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/jupariti.pdfIn PDF document text
    • https://renewone.de/files/kemijimupi.pdfIn PDF document text
    • https://sadex.pl/fck/file/zaliwexuvojowe.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60355224214.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/33271053724.pdfIn PDF document text
    • https://wrd13.com/force/file/39346353655.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/94812766342.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1e26f4fb---36337256451.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/28610053989.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/nololajaxesemove.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/13562586373.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_off0000ba83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 16916 bytes
SHA-256: 238838198d955fb1eee2a733f0c4d29faa36dae00e7143d47cb3f582fed30dc8
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10480 bytes
SHA-256: 94a1c06a7e88452c54befb49142afee410e88d88161239b88430f27f4bd67b58

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