Malicious PDF — malware analysis report

Static analysis result for SHA-256 8508dfa93d77e005…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 06:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 306f0fef3e61b896e943f044db57b986 SHA-1: 1a191deb6bafeb5e3aa3978e905a3f100224ebf8 SHA-256: 8508dfa93d77e005e3e9f13ec4f672976a06d218999a2914158ab50fef2eda9a
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of command-line tokens within the document text, potentially related to executing malicious commands or downloading payloads from URLs like 'http://qdcmd.com/data/files/rowugijodepofi.pdf'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://vico-domrep.com/ckfinder/userfiles/files/66138264482.pdf In PDF document text
    • https://hobbes-group.com/upload/files/pitijesagexemilob.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210918_CC2CB18B35833B46.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3061aca0---lesilawezagegud.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/sosekozutetirasabe.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/tagepuxikajipinuputu.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/jevedasip.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/98082804453.pdfIn PDF document text
    • http://qdcmd.com/data/files/rowugijodepofi.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/viwasefinesiwidir.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3d72d76a---82739266870.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/41114549331.pdfIn PDF document text
    • https://mlspoland.co/files/file/jogedolamuguze.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/80843647965.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/piwagonekis.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/nezuvolorujaxolowel.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ruxemegirufupotiw.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/59393909062.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/2338749535.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fasusokukugujiripidajisu.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78865359527.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/dosivuwiwimir.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/kidezolilikipov.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lolutotavevulako.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109031826585817.pdfIn PDF document text
    • http://okna-kurska.ru/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=menghilangkan+pop+up+iklan+di+hpPDF 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_off0000b882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB882 18460 bytes
SHA-256: 1f4a4a3c36c86be94643c88399be3479faef28b7b3640a6faaa1b65c9db21f8f
font_01_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 10488 bytes
SHA-256: 976d9925660a70a0eb99800bea7bd428b1eb69d4ab11c55e67d82d38af7edd47
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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