Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a352f981e27a60f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-12 16:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 84a9ceb77507c3cade24cc1cc735ed9a SHA-1: 9ed4614389e60682b49a86611ad0b94072aa5cba SHA-256: 0a352f981e27a60fd2a799a6401f8b4adf245857a4905f80f92a9da53303b130
124 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malware or phish users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous malicious links suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=10.4.1.1+packet+tracer+-+skills+integration+challenge+answers In PDF document text
    • http://ramedefinu.getenjoyment.net/fubugezimo.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/rodisakoleganesutumow.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/dojavil.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/dedovare.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/vusuxugazamaxoxu.pdfIn PDF document text
    • http://stepka2016.xyz/57014424462uj7mg.pdfIn PDF document text
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/sosiw-dezapowo-fonud-gofazadati.pdfIn PDF document text
    • http://am-sound.ru/fozapinipalalidujbj6ce.pdfIn PDF document text
    • http://fitit.space/refedonutusuxuzi68q.pdfIn PDF document text
    • https://wenudujajavu.weebly.com/uploads/1/3/5/3/135318124/906a93a9d3c33de.pdfIn PDF document text
    • http://dresdenpharma.ru/concrete_mix_design_lab_report_discussion66zjc.pdfIn PDF document text
    • http://ductsunlimitedins.com/203208092194gnmo.pdfIn PDF document text
    • https://genefitagujutun.weebly.com/uploads/1/3/5/3/135392589/nominusami.pdfIn PDF document text
    • https://norogogobizifuk.weebly.com/uploads/1/3/2/8/132816096/luferunavujafu-numitabatigofus-rejosagip.pdfIn PDF document text
    • http://aires.fun/805783711448z8yl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jirizaxewusi.epizy.com/garrett_hardin_tragedy_of_the_commons_example.pdfIn PDF document text
    • http://nevuwomekemetil.rf.gd/93925818075.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/kiwalisikuvukiruruwapa.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/kofomaxexuzefuni.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/takodutezafokolamaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/arcgis_server_manager.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_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 5604 bytes
SHA-256: ef8867bbc46ebf950ac1213fce1e3187552b7fdda4b58c408be436317a95e299
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 14492 bytes
SHA-256: 8d8902dcbf5f1d0b4dcb48e63e10231c8ca0824232ae5e1ed5f7505481c5d500

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