Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c77b3f2ed7f8a8…

MALICIOUS

PDF

91.5 KB Created: 2021-02-06 18:35:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f3cf33caba3d436346b806e83bc24c9 SHA-1: 45da249116e2b90dafc790501db50c1428661760 SHA-256: 46c77b3f2ed7f8a8f20193b6071092e6dbd3c88f9ecc8460d7998b14f4509c82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous external URLs, with one prominent URL pointing to a suspicious domain ('jottigo.ru') that is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to distribute links across disposable hosting. No scripts were extracted, but the presence of multiple URLs and the high detection scores strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/aws?utm_term=anhydride+formation+using+dcc PDF link annotation
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/nebineposawiwu.pdfIn PDF document text
    • http://wavepolabipal.22web.org/vubesed.pdfIn PDF document text
    • http://gegejobusi.22web.org/alphabet_letter_s_wallpapers_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/iagjicn/2781567033.pdfIn PDF document text
    • https://tivufele.weebly.com/uploads/1/3/4/6/134615601/pupetizigowire.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/igQHujb/mugoro.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/zarogikosadap.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/7129604.pdfIn PDF document text
    • http://lnstagramverifycentre.com/gakubobulasejatodirigosifxb4h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/potamotaz/blurryface_live_mega.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/bizixozusexopikosevezewet.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/brenda_fassie_all_songs.pdfIn PDF document text
    • http://vofiwevo.epizy.com/fevasibusulukozilaki.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/arc_length_using_degrees_and_radians_worksheet.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 5376 bytes
SHA-256: b935275c29e91d9f65b17fdaf2bc403457f82147a5427dcf239a9641e5012bf6
font_01_sfnt_off00011466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 11924 bytes
SHA-256: 36b736db111a9e40c82d7ffe666848201020d6ff4db8711aa975126d2f58144f
font_02_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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