Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9626dc8c9a71baf…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa92cc3482c0a5ae6d9d3798baf2545a SHA-1: c294333f3b4fe7cc92273daed35906a35a5c9988 SHA-256: d9626dc8c9a71baf1b6ea7070058056fa6f26eb2721e052dc5fcd0d18fe0c524
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which are on disposable domains and linked to a 'link farm' heuristic, suggests a phishing or credential harvesting attempt. ClamAV detection and ML classification further confirm its malicious nature, likely as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://nilesk.com/userfiles/file/givibakowo.pdf In PDF document text
    • http://geoass.eu/userfiles/files/75981999282.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133807188cf0---4934859286.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/bomok.pdfIn PDF document text
    • https://aneri12.cz/res/file/76392583064.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/63519844922.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xofabetagabivosuved.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/54236184397.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/lopozilol.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/32622616141.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/73252380681.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/78881348820.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/76513206057.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/48034327459.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/givigo.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/99897597506.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/69441203642.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210919070919.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/gebimoganibi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b1a1ef5fc---didumupojifetanopukuk.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/xenura.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/sominoxisaraxesoxekop.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/14797135206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=3ds+emulator+gamesPDF 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_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 17504 bytes
SHA-256: 32ab4a2b8be7db9bccca1ca6581f1277424afff5a9f5d4773fd50a712b1685ef
font_01_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 10572 bytes
SHA-256: 996d3d8495fabd71666228077eaa069a81f7df413b8b2ab0c65cfe1e57fdb83b

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