Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3dda053887ac9c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 18:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7129c89da265ba1d1310790b71fc11a SHA-1: f75b44e3f7849dd9c7759f1fe9be1dffe931a206 SHA-256: 5e3dda053887ac9c7069ca8fbfa16527b18e66b1b94d47b40a1d6fa971db2388
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one identified as a link farm, suggests an attempt to redirect users to malicious sites or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cplastik.eu/data/cms/file/folunuroziwefed.pdf
    • https://101doctor.com/uploads/ckfiles/files/6146ebff791d0.pdf
    • http://braciszewska-klimek.pl/fck_files/file/vilegoxosudagewenox.pdf
    • http://agisma.ru/files/pages/files/4676529425.pdf
    • https://035620126.tw/upload/greenkitchen/files/solowaluvefi.pdf
    • https://plewmal-d.com/Uploads/files/zuboxajexorani.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-9-20/20210920013419246808.pdf
    • http://vietnaminsight.biz/ckfinder/userfiles/files/xawiwebuvunewimizupogum.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/11488136116.pdf
    • http://interroadholland.nl/userfiles/file/34783793796.pdf
    • http://www.sushmitamukherjee.com/fckimages/file/83941941040.pdf
    • http://cokhitienvuong.com/uploads/files/lulasago.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufosonew.pdf
    • http://colantuono.it/userfiles/files/84049929685.pdf
    • http://benthanhsgfarm.com/images/uploads/files/taxalegimokababenitini.pdf
    • http://addisonplaza.abwingsmd.com/uploads/files/xebezazefetipevuwo.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/lewowanofu.pdf
    • https://officialbacknumber.com/editor_up/vijubejuguwavevuweroxafem.pdf
    • http://tartak-monis.pl/tartak/images/file/muzumi.pdf
    • https://triosms.com/userfiles/file/75247127763.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/walusewoxipexezotagode.pdf
    • http://3qbuy.com/CKEdit/upload/files/7803103590.pdf
    • https://kinhdoanhvaphapluat.com/img-dn/files/30100144774.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/rudekatineforo.pdf
    • https://sambelteri.com/contents/files/tusenubogelaniwizuf.pdf
    • https://aymsoft.us/aym_image/files/kirexud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=get+pokemon+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d766.bin
b6f47e2f8fec413ea3c371ec2049a7331df1c9a511d265b115fdc13e62813c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 17820 bytes
font_01_sfnt_off00010573.bin
37cda8a30cafa944269bd6efe7fc01b39aecbd95dbea91de3b5d0e16423e7306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 10472 bytes
font_02_sfnt_off00011d31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.