Malicious PDF — malware analysis report

Static analysis result for SHA-256 641a198c66af4b4a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 15:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c215a8c44f12314ce996dc1fd5beac52 SHA-1: 4d742f78497cbbe3037df2429f6d085701bcfbb9 SHA-256: 641a198c66af4b4a12c1585805c675ade46cf253d450cdae36daf9b6c7ef2176
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=videobuddy+online+movie+download PDF link annotation
    • https://ltssinternational.com/res/wysiwyg/file/vudogufogelenikov.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139616ddcc33---kuzizasak.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/womot.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202195_7181_758.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/81245298316.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/ragupezejedoxoterikaxo.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/jijadasotosulubilal.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/85613005684.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/8461842470.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tagiguregufiworizusu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136831ec33af---popipawerozeti.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/38480488572.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/51338870478.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210907201527.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/79690051933.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/marisiwazav.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/91947274673.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/65883239896.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75136914186.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/lojiwejewuzexerokemame.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/68581163383.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/89569481460.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kovigixuvake.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210901235734.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_off0000b471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 10520 bytes
SHA-256: dd5d6d61a25ce8b70e8c584273026a06bde4d6412c4ee57b34a43ca6a8f7e1e1
font_02_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 17184 bytes
SHA-256: 20e0505ff87d1f182b9ab70da5289abf9cd0695a00d0da9461b0636142c812b3