Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd2205fb07e4526…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 20:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa01d9291d4aa7d45838295f4d3bd689 SHA-1: 3718a5fcf76233ac30650e833069186ae636f101 SHA-256: bcd2205fb07e4526a1b49e37e4d1e18c17b9ceef216ca13b931e658c5fefe6e5
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many pointing to potentially malicious domains, indicating an attempt to distribute malware or phish users. The presence of a visual download button further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://serextion2006.com/js/upload/files/xokidifediwititepona.pdf In PDF document text
    • http://german-ex.com/images/blog/file/dokavivesosebibalovi.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/2117403624.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/25828173881.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/42828533286.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/35178560891.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kezokujudovexedudoj.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/wagolej.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/43445596701.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/22917944554.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/jigukebedu.pdfIn PDF document text
    • http://dmkert.hu/files/file/dakomejapifizikuwijefe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/676df736676223391ab91fffb11c516e/rivolavilawiwevamini.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109102018168820.pdfIn PDF document text
    • http://a-pluset.com/userfiles/ragutigodu.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/sesakewivowijidez.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/wozivivaxojogotini.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kukoxosowireratejajarid.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911210304.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/28631884502.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/kuxizirozuwizonuroramo.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/doforezawim.pdfIn PDF document text
    • http://cx-gl.hu/images/files/507454582.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/fibunijabefivem.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/luruzepaw.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15455242350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=video+editor+and+free+video+maker+mod+apkPDF 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_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 20264 bytes
SHA-256: 90880f2532998d6ac7073e454cb8a7f5199a6eae99e5cc3f0efa59884ec18892
font_01_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 10572 bytes
SHA-256: da79fb0a9495a00db7ce983860d3e129f7dbfcb85f9e890e651d5a0b689dbc71
font_02_sfnt_off000138fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1