Malicious PDF — malware analysis report

Static analysis result for SHA-256 7129db28b988e597…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 17:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e05804e69432105b9c50667887c194f2 SHA-1: d8f1ce4c6574b51ecdcdbc06e9b2a5abd0065e46 SHA-256: 7129db28b988e5977cf2a1f455a0cf136538b690af29b1b1242bcadb4fd1aa53
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=parallel+app+premium+apk PDF link annotation
    • https://mgrenginiai.lt/ckfinder/userfiles/files/66585846724.pdfIn PDF document text
    • http://topas.lt/userfiles/file/bobiwu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f6806530o4smu94aoi07e0sagu/82077988015.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/vulod.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/32523549303.pdfIn PDF document text
    • http://lgassociates.in/uploads/27403199565.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/96769266100.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210902101840_f3kgac.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/buluwojekeru.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/44408630974.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/86234033149.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f3908f06---doliwaboxojuleg.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/38139612032.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/33471086557.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/21559812910.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/82155984787.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/pofavulos.pdfIn PDF document text
    • http://fitviewer.com/files/file/pewewuderadamawenoru.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/96703477329.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/6895829057.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/29675257805.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/17263815276.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_195314_730.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/77545928099.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/78414000582.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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16720 bytes
SHA-256: fbd52d200e9457220de9e5706ae2c875026736cddfdfec36cd5faa6fe767b146
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 10116 bytes
SHA-256: 1643bb6bb760ae975e84ba2d040e337c3784e0de564145940655431e5f3d81e3