Malicious PDF — malware analysis report

Static analysis result for SHA-256 317986af2fd12842…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 10:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ee3d731a14e9262398e213bdc57d894 SHA-1: 148b13a8271761ff74819bc3fc7ed6284d488dc7 SHA-256: 317986af2fd12842b74738e93f8c202aca0da63a0935330236d27092795608f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term=download' in one of the URLs further supports the lure of downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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=download+dream+league+soccer+2020+apk+and+obb+file PDF link annotation
    • https://sanruouvang.net/images/uploaded/file/35505950556.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/32918814546.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/9633986895.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/dujiteguxago.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/mowob.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/bowotelixudine.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/55184538279.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419c4584244---72745549306.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/50304769606.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/13118332494.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/simotopupepa.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/lowoxigovekatarifu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rakotutakatagunaxisesek.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/wokarofetatimasemitosusuk.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xitafenafazup.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_off0000c16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16E 11524 bytes
SHA-256: 10cc79eb608bd32169b5d87690c99317b6a8ddd4060f3c261d85150e6648ddc7
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 17680 bytes
SHA-256: 5819a32a980dcfbfb69998a88557037fe379ef356fe66070019f8a1bb600a6d1

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