Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4997795eccd6f27…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 01:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee032e65fc73ccc3f664a0a69eeaadb6 SHA-1: 4afa2b5cc0b0e00e364e0d659897c3b62aaec38a SHA-256: c4997795eccd6f27035654de1c51d7b95a12ccacd718464702d0a121f5fc6aa4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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=watch+coco+online+free+123movies
    • https://unitedfightalliance.com/ckfinder/userfiles/files/67189617232.pdf
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xugopotalipapuvobufunopo.pdf
    • http://faisaltowel.com/survey/userfiles/files/22122649051.pdf
    • https://guruamardaspublicschool.com/userfiles/files/61248768622.pdf
    • https://wonkingchina.com/d/files/vutuzipefuxub.pdf
    • http://baiduvpn.com/upload/files/sibajasowadefenabulexi.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/dekugasuxopuxelaf.pdf
    • http://hondaototanan.com/upload/files/xozuridifabesuzapo.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/ponibagigajidakimafusa.pdf
    • http://tgroupsrl.com/userfiles/files/23252658683.pdf
    • https://incoyun.com/calisma2/files/uploads/75624879778.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/83962369070.pdf
    • http://studiorapizza.it/userfiles/files/31725093147.pdf
    • http://saxonrt.hu/img/userfiles/files/55519311112.pdf
    • http://stin-verdon.fr/assets/Image/files/50632564037.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210916212333.pdf
    • http://clevio.biz/fckUpload/file/fujonuputudi.pdf
    • https://dadesigning.com/daduserfiles/files/sewebezimilajoje.pdf
    • http://brenderup.ro/mm/file/96920444021.pdf
    • http://ecohort.com/userfiles/files/jurubo.pdf
    • https://yarpaket.ru/userfiles/file/59996642674.pdf
    • https://actor-conseil.com/files/file/jepuvexakeximevaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 16792 bytes
font_01_sfnt_off0000f046.bin
d738d0ec31adb29d43d331d309c1e11ac6a762047adc9b5bc87acc93fbadb3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 11004 bytes
font_02_sfnt_off000109cb.bin
a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 17844 bytes

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