Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc00870d3740077…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 06:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 33ec372a22a7df64f02a721bccdd7f08 SHA-1: 3994f6ed0ff740993e856bd1513b21517bfacfe6 SHA-256: 2bc00870d3740077cd5c3e47e731f08c4a81fca69dece049034ced7bbef2d322
134 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 suggests the PDF is designed to redirect users to potentially harmful websites, likely for phishing or to download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious nature by indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=record+a+call+on+android PDF link annotation
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/33c1cd5aa9ae4caec8f8a5e3f55a1b8d/susulasig.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/750227442.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/63324845264.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/xidezufikagozolutusim.pdfIn PDF document text
    • http://brenderup.ro/mm/file/82009595776.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/74602557036.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/93278572420.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/77273347914.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/22320170988.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zemaxorew.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/51061655906.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/nevatutenaxisukalis.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/foxuji.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/larup.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tepokubujilipodivad.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemijorijuf.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/fejosakubudefazipitubetur.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210907092813519.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ruxomela.pdfIn PDF document text
    • https://avela.md/userfiles/file/23682677954.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/jiliwapetolitosupav.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/37378845258.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/26996883244.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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 16924 bytes
SHA-256: 6e571ec2195348ed219999381a53c90e74364c24cd992b78af2e0ae144b0c03f
font_02_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 10144 bytes
SHA-256: e410091c0234172f15af4872eeed291c738076070ed381ced3140d35fac87637

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