Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97ef8052ac117a3…

MALICIOUS

PDF

74.2 KB Created: 2021-04-08 00:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d86ff231b5154e0a3f55e5381df3abe8 SHA-1: e79a5aeae62f32e146afe0eabb90cb0854889aa6 SHA-256: f97ef8052ac117a311aec8ece863e908c5ae1e21ac770d82849a4d637d48ea38
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with a high concentration of links pointing to disposable hosting services and using UTM parameters, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://nipisod.ru/123?utm_term=buzzy+buzzy+song PDF link annotation
    • https://rinojoxo.weebly.com/uploads/1/3/4/5/134598976/nirobodoxowanukod.pdfIn PDF document text
    • https://xezorilim.weebly.com/uploads/1/3/4/5/134588859/2e546efc58cd527.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/9599677.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/bwjihaO/42227699058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_5fda69139144e.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/hi7DheT/jogugumowulosowelatekuviw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_600fd76e82cec.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/jzQvhfE/dogfight_musical_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/ibjfigq/8175345605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_6059eeedbb4aa.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/i4jcqDv/galilurejuwuxoriref.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426556/normal_5ff27b84b8dd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_6009857aef4b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somisilegex/chelsea_vs_manchester_united_highlights_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b883f16c-19d8-4156-a2f9-7675436cb5fc/towereruzuguwapo.pdfIn PDF document text
    • http://rapodipowunifo.epizy.com/41408086598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2eeeb7-1ed2-4c05-b2eb-756f1a5f37a5/norelimegawizaru.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/wowofezegeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a19a204-e32b-466d-a532-8c31c39a43dd/sodastream_refill_adapter_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e52ec0-dd31-4713-a04a-795ce29dd0e7/18014445810.pdfIn PDF document text
    • http://legofebufulemo.rf.gd/carteles_informativos_definicion.pdfIn PDF document text
    • http://rekipefivikupa.rf.gd/what_are_the_nicomachean_ethics.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 4856 bytes
SHA-256: 89370ae2a17d99cb87e2c6a971a24cfd2c243204cab5a5d38ad015baaa188c6d
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 11188 bytes
SHA-256: 2c40bafd2eaa749463fdf2bfca7fee6a664924f35f685c1438ad9a2de3e586f9

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