Malicious PDF — malware analysis report

Static analysis result for SHA-256 65415a981819d154…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 03:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9b019b72fd0a64b9f4565f129d08980 SHA-1: 83a9c32e55d0fb888ee16ee5328574e437df6a02 SHA-256: 65415a981819d154fd1414ecf716735afee897e33fa295872e3349f5b48365f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm heuristic, suggests an attempt to direct users to malicious sites or download further payloads. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure to trick users into clicking a deceptive download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://geasit.it/userfiles/files/44762414880.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/96936273554.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/nakobiwuwema.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/tujizuso.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/nafexofebamonixupulewu.pdfIn PDF document text
    • https://masukpt1.com/contents/files/dogemekimokovapino.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/winefojebaxapumefivew.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/besajaf.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/31833238153.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/56734964607.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/gutuwagigutexibudo.pdfIn PDF document text
    • https://aokman-drive.com/d/files/rejogoza.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/75190648740.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/18259541811.pdfIn PDF document text
    • http://erimti.com/userfiles/file/lokefitikokakilino.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/nebupirosozu.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/78067630657.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319bdb7e52f---ximibosigagujosipapabowol.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/67355364011.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/sujidebisomubarazuf.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/memenemoxojabazemil.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614234b1a893f---64818489925.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/raxutuvem.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/6376253440.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/suvajalozibujike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=easy+movie+maker+downloadPDF link annotation
    • 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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10652 bytes
SHA-256: 84304dbba1b63ace1bd07e55568a7ce7999edd538ce9db54e6733cc21b7308a7
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 17140 bytes
SHA-256: ad2a80074f1af861123d62536cd5165633e34769441c3479e785a905a01da456