Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b84648ccb7c3a8…

MALICIOUS

PDF

131.8 KB Created: 2021-09-09 05:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 377b9ade78df11ce6362a70b70464c75 SHA-1: 6977e0fe7360274a3aea6c4e7e4238e1702eb43d SHA-256: f6b84648ccb7c3a8788b25fd06b1b0dede7a59f419448d44151a6315cd4632a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to various domains, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URLs indicate it's likely used as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5439

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://infrive.ru/uplcv?utm_term=kyoko+kirigiri+danganronpa+2 PDF link annotation
    • https://motiwalainstitutes.org/userfiles/file/15933091454.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/vizijudopalugegavizod.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/cc5ba48251cf6e7f373f2fedcccd8b5a/piduguli.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/98722836200.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/gepanok.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/korofowurukererazelavo.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/60574888831.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/adbd30f774021e647f85fc227a5c4e11/25705214640.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/paruremikij.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/54866524273.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/19843579516.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090721482455.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/75585575843.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/47888923370.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zitosezokadubi.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/42162239276.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4857068294.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/16850390848.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/43478909117.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908090310.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/18462518872.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/29245116531.pdfIn 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_off0001a209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ba1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA1B 22004 bytes
SHA-256: 8a385ec29c6e55514c3e02872002529c92c04245ca86d8e1f315aae1ddd79141
font_02_sfnt_off0001f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F413 10440 bytes
SHA-256: 6218c11d710c56e4975d9da84496f747c414ba2146c3ecafbd6643468f5b2d4e

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