Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd114b30a2f771ae…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 23:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93a5b990f3c937747d6a600378f8d59c SHA-1: d40745d1a322b76041136da6551d03a2aed88f65 SHA-256: cd114b30a2f771aef9c9ed7ffa5d5dc988d3825ce74f9f6ec08591a556d47984
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further suggests a lure to trick users into downloading content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=aot+fan+game+by+julhiecio+free+download PDF link annotation
    • https://smartmedia.ro/app/webroot/files/userfiles/files/xajepamamorelufuxerosum.pdfIn PDF document text
    • https://arerp.kr/data/file///sidinuxuka.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/62798394343.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/85434233149.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99002021453.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/suvateladuvidegowosab.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/ribefiregi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613684d491fb1---23115087697.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/59232208853.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/37551051442.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/35176741640.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/63882362019.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/14292025445.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/17/955056449.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/pudepujalegefonunubatezus.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/59682357079.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/29516167679.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/48396663325.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84512785266.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/95422081035.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109021051381184.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/zujixulotafudus.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/45133513747.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_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 18644 bytes
SHA-256: 35c729ca581debe3cb3d74779b29b0828f9f9c112f496a32bf091a750d6c5589
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 11308 bytes
SHA-256: f1007f61511d22fe5a978bfa7c512549639d3e8615750e549db853a15289a529