Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7a5c963b84500e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 04:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49c35b877e9b59786dbf3ea571c6d43e SHA-1: a7a841527cd7b71770d4599735cd877f3fe1c69a SHA-256: eb7a5c963b84500e2970d05bbe409af63f7b39cce81285686baad48bc748b1e5
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 links, some pointing to disposable domains, suggests an attempt to redirect users to malicious content or facilitate phishing. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chowdhurytourism.com/ckfinder/userfiles/files/mufipe.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3dade5d6053e8f17d8d993b63c0175e/66911130121.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/maxaxemuzipetupuj.pdfIn PDF document text
    • http://www.77ice.com/upload/files/21408740402.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/vuxivurekatafekelemej.pdfIn PDF document text
    • http://calisnt.com/uploads/files/ludofobosasitujixev.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/47307995242.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/wujeferuziruzo.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/vofanitomedamali.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/moran.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/vozuziz.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191123335040.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210902042424_hun4lv.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/5369878019.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/84910569623.pdfIn PDF document text
    • http://teifsepahan.com/files/file/tulaj.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/japawijafajavesodo.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/899300972613e7ae1244cb.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/76015326248.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/libobixor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hot+gym+unlimited+gems+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b59fff358010dbd4769569be9bc15d47/56378207653.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 19220 bytes
SHA-256: 80cc47c3f4d8dab0e5752dbb19fa64018a11a524aeb3aa8c2199a015ebe65adf
font_01_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 10932 bytes
SHA-256: 6704d04e0a680fd9dd520871ee83b28033c9381ffe5f6808684e27b0121b2e2a
font_02_sfnt_off00012f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1