Malicious PDF — malware analysis report

Static analysis result for SHA-256 08091495bcc9c5ed…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 18:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9676d81b9546f2287395703ab02c6ec7 SHA-1: e741ce4506f2e97e7f7a43a83cfa53a3a4429b77 SHA-256: 08091495bcc9c5ed17b35b1e3d0cfa339d41ce1434c62f9597453be1d26657eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. No scripts were extracted, but the presence of multiple external URLs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=texas+holdem+poker+deluxe+mod+apk PDF link annotation
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/95274927966.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/zobobidalaxixetolukix.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/76841209356.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/toxitamoreleba.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/56345014816.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16143a884cbe6d---70192835473.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908154537.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/fedokitajiju.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/sejarunupopuxikulapi.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/86395406578.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/25982443312.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/72223126154.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97851181316.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/wakiwig.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/nidujawelamugupugamekogi.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vasodoxegilufis.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/kiniraxuropumoxufoboga.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/68639345924.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210909050831933282k4vexp.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/67429142582.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/diwikekut.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/tunobutosome.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96934093597.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/xebipabudefifujesetumadus.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 19716 bytes
SHA-256: aa89905480ee73651ad2790af7b32930afa427f4c51ab1fc64ac3c4ea29f6a65
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10620 bytes
SHA-256: 7170baeff28ffd9a784ba461ea1822e2ad43fd6d01f880d1ca6937922389efac
font_02_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1